对mbstring.func_overload不易碎的substr()实现
原型
RandomCompat_substr( string $binary_string, int $start, int $length = null )
描述
这个版本只使用默认的substr()
参数
$binary_string
(string)
(Required)
$start
(int)
(Required)
$length
(int)
(Optional)
(可选的)
返回值
(string)
源文件
路径:wp-includes/random_compat/byte_safe_strings.php
<?php
...
function RandomCompat_substr($binary_string, $start, $length = null)
{
if (!is_string($binary_string)) {
throw new TypeError(
'RandomCompat_substr(): First argument should be a string'
);
}
if (!is_int($start)) {
throw new TypeError(
'RandomCompat_substr(): Second argument should be an integer'
);
}
if ($length !== null) {
if (!is_int($length)) {
throw new TypeError(
'RandomCompat_substr(): Third argument should be an integer, or omitted'
);
}
return substr($binary_string, $start, $length);
}
return substr($binary_string, $start);
}
...
?>
其他
英文文档:https://developer.wordpress.org/reference/functions/randomcompat_substr/