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PHP strtolower () function

PHP String Reference PHP String Reference

Examples

All the characters are converted to lowercase:

<?php
echo strtolower("Hello WORLD.");
?>

Running instance »

Definition and Usage

strtolower () function to convert a string to lowercase.

Note: This function is binary safe.

Related functions:

  • the strtoupper () - convert a string to uppercase
  • lcfirst () - the first character of the string converted to lowercase
  • ucfirst () - the first character of the string to uppercase
  • ucwords () - the first character of each word in a string to uppercase

grammar

strtolower( string )

参数 描述
string 必需。规定要转换的字符串。

technical details

return value: Returns a string converted to lowercase.
PHP version: 4+


PHP String Reference PHP String Reference