- print_r: documentation ( source)
- in_array: documentation ( source)
- str_split: documentation ( source)
<?php
$strArr = str_split('AGHIJKLAL');
print_r($strArr);
$temp = [];
foreach($strArr as $v){
if(in_array($v, $temp)){
$repeatChar = $v;
break;
}else{
$temp[] = $v;
}
}
echo $repeatChar;