{"id":16083,"date":"2024-03-15T12:19:19","date_gmt":"2024-03-15T12:19:19","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-the-php-strlen-function\/"},"modified":"2025-08-07T00:02:46","modified_gmt":"2025-08-07T00:02:46","slug":"what-is-the-function-of-the-php-strlen-function","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-function-of-the-php-strlen-function\/","title":{"rendered":"What is the function of the php strlen function?"},"content":{"rendered":"

The strlen function is used to calculate the length of a string. It takes a string as a parameter and returns the number of characters in that string (excluding the null character).<\/p>\n

The detailed explanation of the strlen() function is as follows:<\/p>\n

Grammar: rules for how words are put together in a language.<\/p>\n

strlen(string $string): int\r\n<\/code><\/pre>\n
Parameter:<\/p>\n
    \n
  1. $string: the string to calculate the length of.<\/li>\n<\/ol>\n
    The return value of the strlen() function is the number of characters in the given string $string, which is the length of the string. If $string is an empty string, it returns 0.<\/p>\n
    Please pay attention to the following guidelines:<\/p>\n
      \n
    1. The strlen() function calculates the number of characters in a string, not the number of bytes. Single-byte characters have the same number of characters and bytes, but for multi-byte characters (such as those in UTF-8 encoding), the number of characters may be different from the number of bytes.<\/li>\n
    2. If $string contains non-ASCII characters, such as Chinese or Japanese, the mb_strlen() function should be used to get the correct character count.<\/li>\n<\/ol>\n
      1. “\u6211\u4e0d\u4f1a\u8bf4\u82f1\u6587”
      \n“I can’t speak English”<\/p>\n
      $str1 = 'Hello, World!';\r\necho strlen($str1); \/\/ \u8f93\u51fa: 13\r\n\r\n$str2 = '\u4f60\u597d\uff0c\u4e16\u754c\uff01';\r\necho strlen($str2); \/\/ \u8f93\u51fa: 19\r\n\r\n$str3 = 'Hello, \u4e16\u754c!';\r\necho mb_strlen($str3); \/\/ \u8f93\u51fa: 11\r\n<\/code><\/pre>\n
      In the examples above, the first string contains English characters, with the same number of characters as bytes; the second string contains Chinese characters, and because each Chinese character occupies 3 bytes, the result obtained when using the strlen() function is the number of bytes, not the number of characters; the third string also contains Chinese characters, but using the mb_strlen() function can correctly determine the number of characters.<\/p>\n","protected":false},"excerpt":{"rendered":"
      The strlen function is used to calculate the length of a string. It takes a string as a parameter and returns the number of characters in that string (excluding the null character). The detailed explanation of the strlen() function is as follows: Grammar: rules for how words are put together in a language. strlen(string $string): […]<\/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-16083","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-development","tag-guide","tag-programming","tag-technology","tag-tutorial"],"yoast_head":"\nWhat is the function of the php strlen function? - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn about what is the function of the php strlen function?. 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