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<?php
// find the number from string and make it sum.
$string = 'I have 3 Bananas and 5 Mongoes';
$numStr = preg_replace("/[^0-9]/",' ',$string);
$sum = array_sum(explode(' ', $string));
echo("$sum \n");
// Second way
preg_match_all('/[0-9]+/',$string, $numStr);
//print_r($numStr);
$sum = array_sum($numStr[0]);
echo("$sum \n");
?>