1.5. Reversing a String by Word or Character
print strrev('This is not a palindrome.'); .emordnilap a ton si sihT
To reverse by words, explode the string by word boundary, reverse the words, then rejoin:
$s = "Once upon a time there was a turtle."; // break the string up into words $words = explode(' ',$s); // reverse the array of words $words = array_reverse($words); // rebuild the string $s = join(' ',$words); print $s; turtle. a was there time a upon Once
Reversing a string by words can also be done all in one line:
$reversed_s = join(' ',array_reverse(explode(' ',$s)));
1.5.4. See Also
Recipe 18.8 discusses the implications of using something other than a space character as your word boundary; documentation on strrev( ) at http://www.php.net/strrev and array_reverse( ) at http://www.php.net/array-reverse.
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