Source Code : Opening a Process File Pointer with popen()

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Opening a Process File Pointer with popen()

 
Its syntax is: int popen (string command, string mode)

command refers to the system command that will be executed, 
mode refers to how you would use the popen() function to search a file:

<?
    $fh = fopen("data.txt","w");
    fputs($fh, "A
");
    fputs($fh,"B
");
    fputs($fh,"C
");
    fclose($fh);
    $fh =popen("grep B < data.txt", "r");
    fpassthru($fh);
?>
  
  

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