preg-match Intermittantly Not Working

[Excession]

Hi Guys,

 

I'm hoping you can help with this one. My function intermittently works and then doesn't work. When I read one phrase from a text file, the application works. When I read 2 or more phrases, the function works for some of the phrases, but not others. So for example the function doesn't match Phrase 1,2 & 3, but matches phrase 4.

 

This is very puzzling. Not too sure if it is a bug in preg_match or problems with using large arrays or something else 

 

Your help will be greatly appreciated

 

Code:

 

Note: $sentences_func is an array of sentences which need to be matched and sorted into 2 arrays. One array is of sentences that contain the Phrase, and the other, sentences that don't contain the phrase.

 

 

function phrase_contained_sort($sentences_func,$file_value_func){

   // Array Tracking Variables for contains_keyword and not_contains_keyword Arrays
     $n1_pcs = 0;
     $n2_pcs = 0;  

   // Prepare REGEX to find Phrase in Sentence
     $phrase_match_func = "{".$file_value_func."}i"; 


   foreach ($sentences_func[0] as $sentences_value_func){
  
     // Remove Immediately Repeating Words from Sentences  
     $de_duplicate_value = de_duplicate_words($sentences_value_func);    
           
     // Test if Phrase is Present in Sentence
     $present_func = preg_match($phrase_match_func, $de_duplicate_value); 
  
     if ($present_func == 1){
    
      $contains_phrase_array_func[$n1_pcs]=$de_duplicate_value;
      $n1_pcs++;        
      }

     else{
    
      $not_contains_phrase_array_func[$n2_pcs]=$de_duplicate_value;
      $n2_pcs++;
      }
  }       
  
  return array($contains_phrase_array_func, $not_contains_phrase_array_func);
}

 

EDITED by akitchin: please use code tags.

[effigy]

Since $file_value_func is being used to a create a regular expression you should escape it via preg_quote.