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strtolower (string $string): string. Returns string with all ASCII alphabetic characters converted to lowercase. Bytes in the range "A" (0x41) to "Z" (0x5a) will be converted to the corresponding lowercase letter by adding 32 to each byte value.
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Definition and Usage. The strtolower () function converts a string to lowercase. Note: This function is binary-safe. Related functions: strtoupper () - converts a string to uppercase. lcfirst () - converts the first character of a string to lowercase. ucfirst () - converts the first character of a string to uppercase.
If you use this function on a unicode string without telling PHP that it is unicode, then you will corrupt your string. In particular, the uppercase 'A' with tilde, common in 2-byte UTF-8 characters, is converted to lowercase 'a' with tilde. This can be handled correctly by: $str = mb_strtolower($str, mb_detect_encoding($str));
29 sty 2020 · By contrast to strtolower(), 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as A-umlaut (Ä).
Introduction to the PHP strtolower () function. The strtolower() function accepts a string and returns a new string with all alphabetic characters converted to lowercase. Here’s the syntax of the strtolower() function: The strtolower() uses the current locale to determine alphabetic characters.
strtolower (string $string): string Returns string with all ASCII alphabetic characters converted to lowercase. Bytes in the range "A" (0x41) to "Z" (0x5a) will be converted to the corresponding lowercase letter by adding 32 to each byte value.
As the UTF-8 non-ascii letters are written with two or more bytes, the strtolower converts each byte separately, and if the byte happens to contain code equal to letters A-Z, it is converted. In the result the sequence is broken, and it no longer represents correct character.
