swap two words in a string php

Question

Suppose there\'s a string \"foo boo foo boo\" I want to replace all fooes with boo and booes with foo. Expected output is \"boo foo boo foo\". What I get is \"foo foo foo fo

Answer 1

If as in this example that is the order of your case then using explode and array_reverse functions can be handy as well:

//the original string
$a = "foo boo foo boo";

//explodes+reverse+implode
$reversed_a = implode(' ', array_reverse(explode(' ', $a)));

//gives boo foo boo foo

PS: May not be memory friendly and may not satisfy all cases surrounding replacement though, but its simply satisfy the example you gave. :)