PHP : Strings - [1.5] Reversing a String by Word or Character

1.5.1 Problem

You want to reverse the words or the characters in a string.

1.5.2 Solution

Use strrev( ) to reverse by 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

1.5.3 Discussion

Reversing a string by words can also be done all in one line:

$reversed_s = join(' ',array_reverse(explode(' ',$s)));