PHP strtolower: Convert String to Lowercase

1 year ago
Ava Mitchell
1 minute

The strtolower() function is a built-in function in PHP that is used to convert all characters in a string to lowercase. This function is typically used when case sensitivity is not required for string operations.

Here is the usage and examples of the strtolower() function:

Usage:

strtolower(string $string): string

parameters:

  1. $string: the string to be converted to lowercase.

“Return value: “

  1. Return the string converted to lowercase letters.

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$str = "Hello World!";
$lowercase_str = strtolower($str);
echo $lowercase_str; // 输出 "hello world!"

In the example above, the strtolower() function converts the string “Hello World!” to lowercase and stores the result in the $lowercase_str variable. The final output is “hello world!”.

The strtolower() function is commonly used for comparing strings by converting both strings to lowercase letters before comparing them, ensuring consistency in case.

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