{"id":21742,"date":"2024-03-15T22:32:17","date_gmt":"2024-03-15T22:32:17","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/"},"modified":"2024-03-21T21:12:48","modified_gmt":"2024-03-21T21:12:48","slug":"how-can-php-determine-if-a-query-has-results","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/","title":{"rendered":"How can PHP determine if a query has results?"},"content":{"rendered":"<p>In PHP, you can use the mysqli_num_rows function to determine if a query has any results. This function returns the number of rows in the query result set.<\/p>\n<p>Here is an example code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5<\/span>\r\n<span class=\"hljs-variable\">$conn<\/span> = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title function_ invoke__\">mysqli<\/span>(<span class=\"hljs-variable\">$servername<\/span>, <span class=\"hljs-variable\">$username<\/span>, <span class=\"hljs-variable\">$password<\/span>, <span class=\"hljs-variable\">$dbname<\/span>);\r\n\r\n<span class=\"hljs-comment\">\/\/ \u68c0\u67e5\u8fde\u63a5\u662f\u5426\u6210\u529f<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-variable\">$conn<\/span>-&gt;connect_error) {\r\n    <span class=\"hljs-keyword\">die<\/span>(<span class=\"hljs-string\">\"\u8fde\u63a5\u5931\u8d25: \"<\/span> . <span class=\"hljs-variable\">$conn<\/span>-&gt;connect_error);\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u6267\u884c\u67e5\u8be2\u8bed\u53e5<\/span>\r\n<span class=\"hljs-variable\">$sql<\/span> = <span class=\"hljs-string\">\"SELECT * FROM \u8868\u540d\"<\/span>;\r\n<span class=\"hljs-variable\">$result<\/span> = <span class=\"hljs-variable\">$conn<\/span>-&gt;<span class=\"hljs-title function_ invoke__\">query<\/span>(<span class=\"hljs-variable\">$sql<\/span>);\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5224\u65ad\u67e5\u8be2\u7ed3\u679c<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-variable\">$result<\/span>-&gt;num_rows &gt; <span class=\"hljs-number\">0<\/span>) {\r\n    <span class=\"hljs-comment\">\/\/ \u67e5\u8be2\u6709\u7ed3\u679c<\/span>\r\n    <span class=\"hljs-comment\">\/\/ \u8fed\u4ee3\u8f93\u51fa\u6bcf\u4e00\u884c\u6570\u636e<\/span>\r\n    <span class=\"hljs-keyword\">while<\/span>(<span class=\"hljs-variable\">$row<\/span> = <span class=\"hljs-variable\">$result<\/span>-&gt;<span class=\"hljs-title function_ invoke__\">fetch_assoc<\/span>()) {\r\n        <span class=\"hljs-keyword\">echo<\/span> <span class=\"hljs-string\">\"\u5b57\u6bb51: \"<\/span> . <span class=\"hljs-variable\">$row<\/span>[<span class=\"hljs-string\">\"\u5b57\u6bb51\"<\/span>]. <span class=\"hljs-string\">\" - \u5b57\u6bb52: \"<\/span> . <span class=\"hljs-variable\">$row<\/span>[<span class=\"hljs-string\">\"\u5b57\u6bb52\"<\/span>]. <span class=\"hljs-string\">\"&lt;br&gt;\"<\/span>;\r\n    }\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u67e5\u8be2\u65e0\u7ed3\u679c<\/span>\r\n    <span class=\"hljs-keyword\">echo<\/span> <span class=\"hljs-string\">\"\u67e5\u8be2\u65e0\u7ed3\u679c\"<\/span>;\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6570\u636e\u5e93\u8fde\u63a5<\/span>\r\n<span class=\"hljs-variable\">$conn<\/span>-&gt;<span class=\"hljs-title function_ invoke__\">close<\/span>();\r\n<\/code><\/pre>\n<p>In the above code, $result->num_rows is used to determine the number of rows in the query result set. If it is greater than 0, it means the query has results; otherwise, it means the query has no results.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In PHP, you can use the mysqli_num_rows function to determine if a query has any results. This function returns the number of rows in the query result set. Here is an example code: \/\/ \u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5 $conn = new mysqli($servername, $username, $password, $dbname); \/\/ \u68c0\u67e5\u8fde\u63a5\u662f\u5426\u6210\u529f if ($conn-&gt;connect_error) { die(&#8220;\u8fde\u63a5\u5931\u8d25: &#8221; . $conn-&gt;connect_error); } \/\/ \u6267\u884c\u67e5\u8be2\u8bed\u53e5 $sql [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-21742","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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 can PHP determine if a query has results? - Blog - Silicon Cloud<\/title>\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-can-php-determine-if-a-query-has-results\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How can PHP determine if a query has results?\" \/>\n<meta property=\"og:description\" content=\"In PHP, you can use the mysqli_num_rows function to determine if a query has any results. This function returns the number of rows in the query result set. Here is an example code: \/\/ \u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5 $conn = new mysqli($servername, $username, $password, $dbname); \/\/ \u68c0\u67e5\u8fde\u63a5\u662f\u5426\u6210\u529f if ($conn-&gt;connect_error) { die(&quot;\u8fde\u63a5\u5931\u8d25: &quot; . $conn-&gt;connect_error); } \/\/ \u6267\u884c\u67e5\u8be2\u8bed\u53e5 $sql [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/\" \/>\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=\"2024-03-15T22:32:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T21:12:48+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin Taylor\" \/>\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=\"Benjamin Taylor\" \/>\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-can-php-determine-if-a-query-has-results\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/\"},\"author\":{\"name\":\"Benjamin Taylor\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/ac801fe9549a25960ce48aa2e0a691c9\"},\"headline\":\"How can PHP determine if a query has results?\",\"datePublished\":\"2024-03-15T22:32:17+00:00\",\"dateModified\":\"2024-03-21T21:12:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/\"},\"wordCount\":83,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/\",\"name\":\"How can PHP determine if a query has results? - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#website\"},\"datePublished\":\"2024-03-15T22:32:17+00:00\",\"dateModified\":\"2024-03-21T21:12:48+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.silicloud.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How can PHP determine if a query has results?\"}]},{\"@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\/ac801fe9549a25960ce48aa2e0a691c9\",\"name\":\"Benjamin Taylor\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/ec2e3d3e2d525fd148047c4520ae7c1cdccd1f4b48a1a488422b31f04f345c14?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/ec2e3d3e2d525fd148047c4520ae7c1cdccd1f4b48a1a488422b31f04f345c14?s=96&d=mm&r=g\",\"caption\":\"Benjamin Taylor\"},\"url\":\"https:\/\/www.silicloud.com\/blog\/author\/benjamintaylor\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"How can PHP determine if a query has results? - Blog - Silicon Cloud","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-can-php-determine-if-a-query-has-results\/","og_locale":"en_US","og_type":"article","og_title":"How can PHP determine if a query has results?","og_description":"In PHP, you can use the mysqli_num_rows function to determine if a query has any results. This function returns the number of rows in the query result set. Here is an example code: \/\/ \u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5 $conn = new mysqli($servername, $username, $password, $dbname); \/\/ \u68c0\u67e5\u8fde\u63a5\u662f\u5426\u6210\u529f if ($conn-&gt;connect_error) { die(\"\u8fde\u63a5\u5931\u8d25: \" . $conn-&gt;connect_error); } \/\/ \u6267\u884c\u67e5\u8be2\u8bed\u53e5 $sql [&hellip;]","og_url":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-15T22:32:17+00:00","article_modified_time":"2024-03-21T21:12:48+00:00","author":"Benjamin Taylor","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Benjamin Taylor","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/"},"author":{"name":"Benjamin Taylor","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/ac801fe9549a25960ce48aa2e0a691c9"},"headline":"How can PHP determine if a query has results?","datePublished":"2024-03-15T22:32:17+00:00","dateModified":"2024-03-21T21:12:48+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/"},"wordCount":83,"commentCount":0,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/","url":"https:\/\/www.silicloud.com\/blog\/how-can-php-determine-if-a-query-has-results\/","name":"How can PHP determine if a query has results? 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