Numbering whenever it meets "a"

PHP
1 
<?php

$myVar1='[COLOR="#FF0000"]a[/COLOR]pcdzefg[COLOR="#FF0000"]a[/COLOR]zbcdr[COLOR="#FF0000"]a[/COLOR]jvr';
$myVar2='egh[COLOR="#FF0000"]a[/COLOR]wqbss[COLOR="#FF0000"]a[/COLOR]tyuv[COLOR="#FF0000"]aa[/COLOR]vxi';
?>

I have a variable “$myVar” like the above.
I like to insert numbering inside “$myVar” before “a”;

myTarget result is like the below.


$target_myVar1='[COLOR="#FF0000"]1a[/COLOR]pcdzefg[COLOR="#FF0000"]2a[/COLOR]zbcdr[COLOR="#FF0000"]3a[/COLOR]jvr';
$target_myVar2='egh[COLOR="#FF0000"]1a[/COLOR]wqbss[COLOR="#FF0000"]2a[/COLOR]tyuv[COLOR="#FF0000"]3a4a[/COLOR]vxi';

How can I change $myVar to $target_myVar like the above?

2

Here’s how i’d do it. There’s probably a better way.


$count = 0;
$string = preg_replace_callback('~a~',function ($match) use (&$count) { $count += 1; return $count."a"; },$string);
3

Not the cleaner way of doing it, but want you to see how you can use a string as an array,


$var = "apcdzefgazbcdrajvr";
$newVar = "";
$counter = 1;

for($i = 0; $i < strlen($var); $i++) {
    if($var[$i] == "a") {
        $newVar .= $counter; 
        $counter++;
    }
    $newVar .= $var[$i];
}

print $newVar; //1apcdzefg2azbcdr3ajvr
4

Thank you, K. Wolfe. I have your code in the below with your help.

$newVar = "apcdzefgazbcdrajvr";
$counter = 1;

for($i = 0; $i < strlen($var); $i++) {
    if($var[$i] == "a") {
        $newVar .= $counter;
        $counter++;
    }
    $newVar .= $var[$i];
}

print $newVar;

But the result of it is like the below.

[b]result[/b]
apcdzefgazbcdrajvr

I like to get my target result below instead of the result above.

[b]target result[/b]
[COLOR="#FF0000"]1[/COLOR]apcdzefg[COLOR="#FF0000"]2[/COLOR]azbcdr[COLOR="#FF0000"]3[/COLOR]ajvr
5

and another:



$var     = "apcdzefgazbcdrajvr";
$newVar  = '';
$counter  = 1;
$token     = strtok($var, "a");
  while ($token != false):
    $newVar .= $counter++ .'a' .$token;
    $token   = strtok("a");
  endwhile;

print $newVar; //1apcdzefg2azbcdr3ajvr
echo '<br /><br />';
6

Thank you, John_Betong.
Your code works fine.