{"id":1561,"date":"2021-05-08T11:54:15","date_gmt":"2021-05-08T11:54:15","guid":{"rendered":"https:\/\/phptutorial.net\/?page_id=1561"},"modified":"2021-05-08T12:03:19","modified_gmt":"2021-05-08T12:03:19","slug":"php-strtoupper","status":"publish","type":"page","link":"https:\/\/www.phptutorial.net\/php-tutorial\/php-strtoupper\/","title":{"rendered":"PHP strtoupper"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to use the PHP strtoupper()<\/code> function to convert all alphabetic characters of a string to uppercase.<\/p>\n\n\n\n

Introduction to the PHP strtoupper() function #<\/a><\/h2>\n\n\n\n

The strtoupper()<\/code> function accepts a string and returns a new string<\/a> with all alphabetic characters converted to uppercase.<\/p>\n\n\n\n

The following shows the syntax of the strtoupper()<\/code> function:<\/p>\n\n\n

strtoupper ( string $string ) : string<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
The strtoupper()<\/code> uses the current locale to determine alphabetic characters.<\/p>\n\n\n\n
To return a new string in a specific encoding with all alphabetic characters converted to uppercase, you use the mb_strtoupper()<\/code> function instead:<\/p>\n\n\n
mb_strtoupper ( string $string , string|null<\/span> $encoding = null<\/span> ) : string<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
The following defines a upper()<\/code> function that returns a new string with all characters converted uppercase:<\/p>\n\n\n
<?php<\/span>\n\nif<\/span> (!function_exists('upper'<\/span>)) {\n    function<\/span> upper<\/span>(string $value)<\/span> : string<\/span>\n    <\/span>{\n        return<\/span> mb_strtoupper($value, 'UTF-8'<\/span>);\n    }\n}<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
PHP strtoupper() function examples #<\/a><\/h2>\n\n\n\n
The following example uses the strtoupper()<\/code> function to convert the string php<\/code> to uppercase:<\/p>\n\n\n
<?php<\/span>\n\necho<\/span> strtoupper('php'<\/span>);<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
PHP<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
Summary #<\/a><\/h2>\n\n\n\n
  • Use the strtoupper()<\/code> function to return a new string from a string with all characters converted to uppercase.<\/li>
  • Use the mb_strtoupper()<\/code> to convert a string with a specific encoding to uppercase.<\/li><\/ul>\n
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To return a new string with all alphabetic characters converted to lowercase, you use the strtolower()<\/a><\/code> function.<\/p>\n\n\n\n