Question

Could you tell how to replace string by preg-replace (need regular expression):

/user/{parent_id}/{action}/step/1

At the equivalent values of an array:

array('parent_id'=>32, 'action'=>'some');

To make:

/user/32/some/step/1

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Addition

This is a typical problem, so I probably will not know what the names of variables come

Answer 1

$arr = array('parent_id'=>32, 'action'=>'some');

$out = str_replace(array_keys($arr),array_values($arr),$in);

no need for regexps!