php 删除字符串两端的字符串

// 删除字符串两端的字符串
function str_trim($str,$remove){
    return str_rtrim(str_ltrim($str,$remove),$remove);
}
function str_ltrim($str,$remove){
    if(!$str || !$remove) return $str;
    while(substr($str,0,strlen($remove)) == $remove){
        $str = substr($str,strlen($remove));
    }
    return $str;
}
function str_rtrim($str,$remove){
    if(!$str || !$remove) return $str;
    while(substr($str,-strlen($remove)) == $remove){
        $str = substr($str,0,-strlen($remove));
    }
    return $str;
}

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