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@ 2018-01-26T20:19:06Z

<?php


function toArray($s){
    $operators = array('+','-','*','/','%','(',')');
    
    $finalArr = [];
    $curStr = '';
    foreach (str_split($s) as $char) {
        if (in_array($char, $operators)) {
            //Alright, we have an operator. Append the entire number
            $finalArr[] = $curStr;
            //And also the operator
            $finalArr[] = $char;
            //Reset the current string back to empty
            $curStr = '';
        } else {
            //Not an operator? Just keep appending the current number
            $curStr .= $char;
        }
    }
    
    //Add final leftover string
    if ($curStr !== '') { //Sanity check here (This shouldn't ever be empty, as you wouldn't end with an operator)
        $finalArr[] = $curStr;
    }
    
    //Return
    return $finalArr;
}

$string = '6+4*4+100+444*6*13*14';

$arr = toArray($string);

print_r($arr);

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.29, 8.4.1 - 8.4.14, 8.4.16, 8.5.0 - 8.5.1: Array ( [0] => 6 [1] => + [2] => 4 [3] => * [4] => 4 [5] => + [6] => 100 [7] => + [8] => 444 [9] => * [10] => 6 [11] => * [12] => 13 [13] => * [14] => 14 )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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