php - Trying to only echo lines containing string -

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I am trying to read a simple line-by-line of a file and resonates all the lines in which the user input The problem is that it shows every line that if any one matches, then am I sure that I am just making a mess of a reasonable brain, no one is sleeping, who is impotent for taking annoyance is? 

    
 File example -  
  Bob class 1 class 1 den class 2   
 Example 1 (correct) < / P> 
  Input: horse output: nothing (true)   
 Example 2 (wrong)  
  Input: class 1 Output: Bob Class 1, Class 1 Dan Class 2 (Everything!)   
 
 
 You  Preg_match ()  foreach  Function inside the loop:  
  foreach ($ height as $ alegre) {if (preg_match ("/ $ klassekode / i", $ Height) === 1) {echo $ elev; }}

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