PHP：替换完全字符串

Question

I am trying to replace exact string with some other string but all what i have been trying not really work as i need.

Here is my string: http://test.com/?plus=&quotea=&quoteb=

I need to replace quotea= to quotea=cat so that quoteb want change.

I tried:

preg_replace('/quotea=/', 'quotea='. $parmeter.'', $str, 1);

str_replace( 'quotea=', 'quotea='. $parmeter.'', $str, $i );

After i run one of the code the result is:

http://test.com/?plus="ea=cat"eb=

What i am missing here?

Answer 1

You could use preg_replace to change the value of quotea regardless of whether it has a value or not:

$str = 'http://test.com/?plus=&quotea=&quoteb=';
$rep = 'cat';

echo preg_replace('/quotea=[^&]*&quoteb/', "quotea=$rep&quoteb", $str);