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@ 2017-07-12T22:03:55Z

<?php
$n = 5;
$str = "-1 -14 5 -61 -2";
$e = "";
$m = "-";
$s = 0;
for($i = 0, $len = strlen($str); $i < $len; $i++ ) {
        if(is_numeric($str[$i])) {
            $result[$s] .= $e . $str[$i];
        }
        else {
            if($m == $str[$i]) {
                $e = $m;
            }
            else {
                $e = "";
                $s++;                
            }
        }
    }
for($i = 0; $i < $n; $i++) {
    echo $result[$i] . "\n";
}

Output
Performance
VLD
References
Branches

is_numeric: documentation ( source)

preferences:dark modelive preview

49.83 ms | 402 KiB | 5 Q