PHP实现一个函数查找字符串数组中最长的公共前缀字符串

代码块

function getCommonPreLongStr()
{
$array = [ 'leets','leetcode','leetc','aaaaa','le'];
$pre = '';
foreach ($array as $v){
if(empty($pre)){
$pre = $v;
}else{
//将字符串分割成数组，取两个数组的交集
$res =  implode('',array_intersect(str_split($pre),str_split($v)));
//不存在公共部分，不做处理
if(isset($res)){
$pre = $res;
}
}
}
//通过前缀获取最长字符串
$res = '';
foreach ($array as $value){
$match = strstr($value,$pre);
if(empty($res)){
$res = $match;
}else{
if(strlen($match) > strlen($res)){
$res = $match;
}
}
}

var_dump($res);die;
return  $res;
}