{"id":17003,"date":"2024-03-15T14:04:29","date_gmt":"2024-03-15T14:04:29","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/"},"modified":"2025-08-07T07:41:57","modified_gmt":"2025-08-07T07:41:57","slug":"how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/","title":{"rendered":"How to resolve the issue of invalid usage of array_inte&#8230;"},"content":{"rendered":"<p>There could be a few possible reasons why the array_intersect() function is not working.<\/p>\n<ol>\n<li>perform a mapping operation on each element of an array<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-variable\">$array1<\/span> = [<span class=\"hljs-string\">'1'<\/span>, <span class=\"hljs-string\">'2'<\/span>, <span class=\"hljs-string\">'3'<\/span>];\r\n<span class=\"hljs-variable\">$array2<\/span> = [<span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>];\r\n\r\n<span class=\"hljs-variable\">$array1<\/span> = <span class=\"hljs-title function_ invoke__\">array_map<\/span>(<span class=\"hljs-string\">'intval'<\/span>, <span class=\"hljs-variable\">$array1<\/span>);\r\n\r\n<span class=\"hljs-variable\">$result<\/span> = <span class=\"hljs-title function_ invoke__\">array_intersect<\/span>(<span class=\"hljs-variable\">$array1<\/span>, <span class=\"hljs-variable\">$array2<\/span>);\r\n<span class=\"hljs-title function_ invoke__\">print_r<\/span>(<span class=\"hljs-variable\">$result<\/span>);\r\n<\/code><\/pre>\n<ol>\n<li>The values in an array are objects, but objects are compared by reference rather than by value. If you want to compare the property values of objects, you can achieve this by customizing an anonymous function.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Item<\/span> <\/span>{\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-variable\">$id<\/span>;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">__construct<\/span>(<span class=\"hljs-params\"><span class=\"hljs-variable\">$id<\/span><\/span>) <\/span>{\r\n        <span class=\"hljs-variable language_\">$this<\/span>-&gt;id = <span class=\"hljs-variable\">$id<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">getId<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-variable language_\">$this<\/span>-&gt;id;\r\n    }\r\n}\r\n\r\n<span class=\"hljs-variable\">$item1<\/span> = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-number\">1<\/span>);\r\n<span class=\"hljs-variable\">$item2<\/span> = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-number\">2<\/span>);\r\n<span class=\"hljs-variable\">$item3<\/span> = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Item<\/span>(<span class=\"hljs-number\">3<\/span>);\r\n\r\n<span class=\"hljs-variable\">$array1<\/span> = [<span class=\"hljs-variable\">$item1<\/span>, <span class=\"hljs-variable\">$item2<\/span>];\r\n<span class=\"hljs-variable\">$array2<\/span> = [<span class=\"hljs-variable\">$item2<\/span>, <span class=\"hljs-variable\">$item3<\/span>];\r\n\r\n<span class=\"hljs-variable\">$result<\/span> = <span class=\"hljs-title function_ invoke__\">array_intersect<\/span>(<span class=\"hljs-variable\">$array1<\/span>, <span class=\"hljs-variable\">$array2<\/span>);\r\n<span class=\"hljs-title function_ invoke__\">print_r<\/span>(<span class=\"hljs-variable\">$result<\/span>); <span class=\"hljs-comment\">\/\/ []<\/span>\r\n\r\n<span class=\"hljs-variable\">$result<\/span> = <span class=\"hljs-title function_ invoke__\">array_uintersect<\/span>(<span class=\"hljs-variable\">$array1<\/span>, <span class=\"hljs-variable\">$array2<\/span>, function(<span class=\"hljs-variable\">$a<\/span>, <span class=\"hljs-variable\">$b<\/span>) {\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-variable\">$a<\/span>-&gt;<span class=\"hljs-title function_ invoke__\">getId<\/span>() &lt;=&gt; <span class=\"hljs-variable\">$b<\/span>-&gt;<span class=\"hljs-title function_ invoke__\">getId<\/span>();\r\n});\r\n<span class=\"hljs-title function_ invoke__\">print_r<\/span>(<span class=\"hljs-variable\">$result<\/span>); <span class=\"hljs-comment\">\/\/ [$item2]<\/span>\r\n<\/code><\/pre>\n<p>Please make sure the data types being compared are consistent and use the appropriate comparison function according to your needs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There could be a few possible reasons why the array_intersect() function is not working. perform a mapping operation on each element of an array $array1 = [&#8216;1&#8217;, &#8216;2&#8217;, &#8216;3&#8217;]; $array2 = [2, 3, 4]; $array1 = array_map(&#8216;intval&#8217;, $array1); $result = array_intersect($array1, $array2); print_r($result); The values in an array are objects, but objects are compared by [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[453,1402,299,1404,1403],"class_list":["post-17003","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to resolve the issue of invalid usage of array_inte... - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about how to resolve the issue of invalid usage of array_intersect in php?. Comprehensive guide with examples and best practices.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to resolve the issue of invalid usage of array_inte...\" \/>\n<meta property=\"og:description\" content=\"Learn about how to resolve the issue of invalid usage of array_intersect in php?. Comprehensive guide with examples and best practices.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T14:04:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-07T07:41:57+00:00\" \/>\n<meta name=\"author\" content=\"Olivia Parker\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Olivia Parker\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\"},\"author\":{\"name\":\"Olivia Parker\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3ff7b3da0e45ac5dbbef2502f3cea8d9\"},\"headline\":\"How to resolve the issue of invalid usage of array_inte&#8230;\",\"datePublished\":\"2024-03-15T14:04:29+00:00\",\"dateModified\":\"2025-08-07T07:41:57+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\"},\"wordCount\":92,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"keywords\":[\"Development\",\"guide\",\"programming\",\"technology\",\"tutorial\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\",\"name\":\"How to resolve the issue of invalid usage of array_inte... - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#website\"},\"datePublished\":\"2024-03-15T14:04:29+00:00\",\"dateModified\":\"2025-08-07T07:41:57+00:00\",\"description\":\"Learn about how to resolve the issue of invalid usage of array_intersect in php?. Comprehensive guide with examples and best practices.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.silicloud.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How to resolve the issue of invalid usage of array_inte&#8230;\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/blog\/\",\"name\":\"Silicon Cloud Blog\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\",\"name\":\"Silicon Cloud Blog\",\"url\":\"https:\/\/www.silicloud.com\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/wp-content\/uploads\/2023\/11\/EN-SILICON-Full.png\",\"contentUrl\":\"https:\/\/www.silicloud.com\/blog\/wp-content\/uploads\/2023\/11\/EN-SILICON-Full.png\",\"width\":1024,\"height\":1024,\"caption\":\"Silicon Cloud Blog\"},\"image\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\",\"https:\/\/twitter.com\/SiliCloudGlobal\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3ff7b3da0e45ac5dbbef2502f3cea8d9\",\"name\":\"Olivia Parker\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/56c66f189ba32a6f9eb50f31a38fe774e2a725c213d4070835ccc51b8fbbc54b?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/56c66f189ba32a6f9eb50f31a38fe774e2a725c213d4070835ccc51b8fbbc54b?s=96&d=mm&r=g\",\"caption\":\"Olivia Parker\"},\"url\":\"https:\/\/www.silicloud.com\/blog\/author\/oliviaparker\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"How to resolve the issue of invalid usage of array_inte... - Blog - Silicon Cloud","description":"Learn about how to resolve the issue of invalid usage of array_intersect in php?. Comprehensive guide with examples and best practices.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/","og_locale":"en_US","og_type":"article","og_title":"How to resolve the issue of invalid usage of array_inte...","og_description":"Learn about how to resolve the issue of invalid usage of array_intersect in php?. Comprehensive guide with examples and best practices.","og_url":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-15T14:04:29+00:00","article_modified_time":"2025-08-07T07:41:57+00:00","author":"Olivia Parker","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Olivia Parker","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/"},"author":{"name":"Olivia Parker","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3ff7b3da0e45ac5dbbef2502f3cea8d9"},"headline":"How to resolve the issue of invalid usage of array_inte&#8230;","datePublished":"2024-03-15T14:04:29+00:00","dateModified":"2025-08-07T07:41:57+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/"},"wordCount":92,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"keywords":["Development","guide","programming","technology","tutorial"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/","url":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/","name":"How to resolve the issue of invalid usage of array_inte... - Blog - Silicon Cloud","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/#website"},"datePublished":"2024-03-15T14:04:29+00:00","dateModified":"2025-08-07T07:41:57+00:00","description":"Learn about how to resolve the issue of invalid usage of array_intersect in php?. Comprehensive guide with examples and best practices.","breadcrumb":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.silicloud.com\/blog\/how-to-resolve-the-issue-of-invalid-usage-of-array_intersect-in-php\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.silicloud.com\/blog\/"},{"@type":"ListItem","position":2,"name":"How to resolve the issue of invalid usage of array_inte&#8230;"}]},{"@type":"WebSite","@id":"https:\/\/www.silicloud.com\/blog\/#website","url":"https:\/\/www.silicloud.com\/blog\/","name":"Silicon Cloud Blog","description":"","publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.silicloud.com\/blog\/#organization","name":"Silicon Cloud Blog","url":"https:\/\/www.silicloud.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.silicloud.com\/blog\/wp-content\/uploads\/2023\/11\/EN-SILICON-Full.png","contentUrl":"https:\/\/www.silicloud.com\/blog\/wp-content\/uploads\/2023\/11\/EN-SILICON-Full.png","width":1024,"height":1024,"caption":"Silicon Cloud Blog"},"image":{"@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/SiliCloudGlobal\/","https:\/\/twitter.com\/SiliCloudGlobal"]},{"@type":"Person","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3ff7b3da0e45ac5dbbef2502f3cea8d9","name":"Olivia Parker","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/56c66f189ba32a6f9eb50f31a38fe774e2a725c213d4070835ccc51b8fbbc54b?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/56c66f189ba32a6f9eb50f31a38fe774e2a725c213d4070835ccc51b8fbbc54b?s=96&d=mm&r=g","caption":"Olivia Parker"},"url":"https:\/\/www.silicloud.com\/blog\/author\/oliviaparker\/"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/posts\/17003","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/comments?post=17003"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/posts\/17003\/revisions"}],"predecessor-version":[{"id":159612,"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/posts\/17003\/revisions\/159612"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/media?parent=17003"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/categories?post=17003"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/blog\/wp-json\/wp\/v2\/tags?post=17003"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}