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up vote 1 down vote favorite

I have a link in format like

http://example.com/a/b.swf

I want to to convert it to

http://cache.example.com/a/b.swf

How can I do it?

I tried it with PHP's explode() function but when I explode some part of string, then I add it to itself it does not work.

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Please show the code that you already have. –  Sanja Sep 29 '13 at 21:27
    
Don't explode() urls, rather use function parse_url(). –  Glavić Sep 29 '13 at 21:50
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4 Answers

up vote 2 down vote accepted 
$str = 'http://example.com/a/b.swf';
$str = str_replace('http://', 'http://cache.', $str);
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up vote 3 down vote 
$new_string = str_replace('http://example.com/', 'http://cache.example.com/', $orig_string);

?

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but values comes from a variable dynamically? –  hakiko Sep 29 '13 at 21:25
    
$new_string = str_replace(array_keys($map), array_values($map), $orig_string); if $map=array('example.com/'=>'http://cache.example.com/',...); –  Lajos Veres Sep 29 '13 at 21:26
    
When you replace the complete string with http... then its equal if there paramters. –  Stony Sep 29 '13 at 21:26
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up vote 2 down vote

If you want to be more "professional", then use a special function http://php.net/manual/en/function.parse-url.php to parse URL.

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up vote 0 down vote

Try str_replace: str_replace ($search , $replace , $subject [, int &$count ])

$str = 'http://example.com/a/b.swf';
$substr = 'http://';
$attachment = 'cache.';

$newstring = str_replace($substr, $substr.$attachment, $str);
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