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Strings (cont)

More operations on strings:

split() partitions string into array via delimiter 

// $s == " ab cde fg"
$a = preg_split(' ',$s);
// $a[0]=="" && $a[1]=="ab"
// && $a[2]=="cde" $a[3]=="fg"

join() assembles string from an array 

// $a[0]=="" && $a[1]=="ab"
// && $a[2]=="cde" $a[3]=="fg"
$s = join(":",$a);
// $s == ":ab:cde:fg";

Plus many others ... see PHP Manual for details.