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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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• in_array() function
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• unlink() function
• serialize() function
• unserialize() function

<?php
$var_string = "Hello, world!";
$result = stristr($var_string, "WORLD");
echo $result;
?>