Adding a character in the middle of a string

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There’s probably a simple solution to this that will cause a facepalm. I have time stored as a 4 character long string ie 1300.

I’m trying to display that string as 13:00. I feel like there has to be a solution to this that is more elegant than what I’m doing at the moment.

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I currently have: 

$startTime = get_field($dayStart, $post->ID);
$endTime = get_field($dayEnd, $post->ID);

        for ($x=0; $x = 4; $x++){

            if(x == 2){
                $ST .= ':';
                $ET .= ':';
            } else {
                $ST .= $startTime[x];
                $ET .= $endTime[x];
            }

        }

$startTime = $ST;
$endTime = $ET;

The string will always be 4 characters long.

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4 comments 

  1. $time = "1300";    
$time = substr($time,0,2).':'.substr($time,2,2);

    Edit:

    Here is a general solution to this problem:

    function insertAtPosition($string, $insert, $position) {
    return implode($insert, str_split($string, $position));
}