![]() ![]() The offset parameter can be a negative string, which makes substr return a portion of the string counted from the end of the provided string. This now applies to all the following functions: Prior to PHP 8, it returned false similar to substr. ![]() Grapheme_substr returns an empty string if the offset is larger than the length of the string. iconv_substr('FooBar', -42, 4) // "FooB" grapheme_substr On negative string offsets, iconv_substr function clamps the offset to the length of the string. This is changed in PHP 8 to return an empty string. Iconv_substr returned false if the offset is larger than the length of the provided string. Mb_substr already returns an empty string in all PHP versions, and is not changed in PHP 8.0. Substr returns an empty string if the offset is larger than the length of the string. In PHP 8, the behavior of these functions have changed. substr and its complement functions (except mb_string) from other extensions return false. In the snippet above, the string offset parameter is 42, although the string itself is only 6 characters. Grapheme_substr('FooBar', 42, 3) // false This violated the documented function signature that mentioned string as the return type.įor example, prior to PHP 8, the following snippet returns false on these functions: substr('FooBar', 42, 3) // false Prior to PHP 8, if the offset parameter is longer than the provided string itself, it returned a boolean false. Substr, mb_substr, iconv_substr, and graphme_substr functions in PHP provides a way to retrieve a part of the provided string. ![]()
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