php - How to search for a pattern like [num:0] and replace it? -

I know that there are many tutorials and there is a question about taking place in some strings.

But I say that I have such a string

  $ string = "Hello! [Number: 0]";   
 And such an example table  
  $ array = array (); $ Array [0] = array ('name' = & gt; "no"); $ Array [1] = array ('name' = & gt; "nam");   
 Now what do I need to do that PHP should first look for patterns like  [num: x] , where  x  is a valid key Replace with the array and then with the key of the array matching it. For example, the above string should be created:  Hi! N   
 I was thinking of doing this way:  
 
 Search for patterns.  
 If found, then call a function that checks if the number is valid or not.  
 If valid, will return the name of that key as name 0 or 1 etc.  
 Changes the returned value from the function in PHP, instead of the pattern string.   
 But I can not find any way to execute this idea. How do I match that method and call the function for every match?  
 This is the only way I am thinking of doing. Any other way will work too.  
 If you have any doubts about my question, please ask in the comments.   
 
 
 try it  
  $ string = "Hello! [Number: 0] "; $ Array = array (); $ Array [0] = array ('name' = & gt; "no"); $ Array [1] = array ('name' = & gt; "nam"); Echo preg_replace ("# (\!)? \ S + \ [num: (\ d +) \] # i.e. ',' isset ($ array [\ 2])?" \ 1 ". $ Array [\ 2] ["Name"]: "" ', $ string);