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• stristr() function
• strstr() function
• strrev() function
• substr() function
• ucfirst() function
• ucwords() function
• array_keys() function
• array_map() function
• array_merge() function
• array_combine() function
• array_push() function
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• array_sum() function
• in_array() function
• count() function
• sizeof() function
• isset() function
• unset() function
• unlink() function
• serialize() function
• unserialize() function

<?php
$array = array(1, 2, 3, 4, 5);
$sum = array_sum($array);
echo "Sum is: " . $sum; 
?>