Web Reference: Bytes in the range "A" (0x41) to "Z" (0x5a) will be converted to the corresponding lowercase letter by adding 32 to each byte value. This can be used to convert ASCII characters within strings encoded with UTF-8, since multibyte UTF-8 characters will be ignored. To convert multibyte non-ASCII characters, use mb_strtolower (). Convert all characters to lowercase: echo strtolower ("Hello WORLD."); The strtolower () function converts a string to lowercase. Note: This function is binary-safe. Related functions: Required. Specifies the string to convert. Jul 11, 2025 · The strtolower () function is used to convert a string into lowercase. The only parameter to this function is a string that is to be converted to lower-case. This function returns a string in which all the alphabets are lower-case. Examples: strtolower($str) Below programs illustrate the strtolower () function in PHP: Example 1: Output: Example 2:
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