title: How can i reduce my text file size?
body: <p>I have a php code that gets product IDs from my database (23436 unique records).</p>
  
  <p>I fetch each product ID and check if it has been set in feature_product table by comparing productIDs. </p>
  
  <p>If no records are found under that ID in features tables than I get check a trial.txt file for the missing features of the products again by comparing the productID in the text file with the productID that was not present in the feature_product table. </p>
  
  <p>The problem is the trial.txt file has 593262 lines in it and it takes forever to match productID in this file. I run out of memory. I took me 15 hours to actually get all the data off the file and that too in parts manually. Is there any way to make it faster or not run out of time and memory? </p>
  
  <p>I tried increasing the max execution time in my php.ini file as suggested by some posts on sites. But it keeps running out of memory or max execution time. I will be using mysqli once i get this right, as mysql is not used any more. I thought of dividing the product IDs so i can loop only say 5000 at a time but I don't think it would help in execution time. </p>
  
  <pre><code>&lt;?php
  $conn = mysql_connect("localhost", "dbuser", "pwd");  
  
   //loop through the 1st line to avoid the headers in csv
   if (!$conn){ 
   die('Could not connect : ' . mysql_error()); 
   echo mysql_error();
   }  
   echo '&lt;p&gt;Connected!';
  
   mysql_select_db("mydb") or die( "Unable to select database");
  
  //Select all product ids from product table into product array
   $pArray = mysql_query("SELECT `id_product` from `product`",$conn);
  
   //loop through each product id
   while($row = mysql_fetch_assoc($pArray)) {
  
   //get product ID to check if it exists in features table
   $productID = $row["id_product"];
  
  //check whether product id exists in feature table where product_id matches both product table and features table
   $fArray = mysql_query("SELECT * from `feature_product` WHERE `id_product`=$productID");
  
  //if product Id does not have entry in feature table than call a function to get check if product id has features in text file
  if(mysql_num_rows($fArray) ==0)
   {
   checkFeatures($productID);
   }
   else continue;
  }
  
  function checkFeatures($productID){
  //trial.txt contains features of the products that are missing in features table but the products are in products table
  $fd = fopen('trial.txt', 'r');
  $fheader = fgets($fd); 
  
  //creates a new text file to save all features(multiple records per product) separated by ',' for future use
  $my_file = 'file.txt';
  $handle = fopen($my_file, 'a') or die('Cannot open file:  '.$my_file);
  
  while (($data = fgetcsv($fd,0, "~")) !== FALSE) {
  //Since this text file has many products i only get the ones that are missing in the features table by comparing product ID which is the 1st element of data array
       if($data[0]==$productID){
       $d= $data[0].",".$data[1].",".$data[2].$data[3]."\n";
       echo $d."&lt;BR/&gt;";
       fwrite($handle, $d);
       }  
  }
  fclose($fd);
  fclose($handle);
  
     }
  ?&gt;  
  </code></pre>
  
  <p>example of <strong>product table</strong>  </p>
  
  <pre><code>id_product,shop,manufacutrer,category  
  1000010,1,41,1112,1  
  1000011,1,7,1721,1  
  1000012,1,7,1721,1  
  </code></pre>
  
  <p>example of <strong>feature table</strong>  </p>
  
  <pre><code>feature_id,id_product,value  
  1,1000010,1  
  3,1000010,2  
  6,1000011,5  
  11,1931555,1 
  </code></pre>
  
  <p>sample <strong>trial.txt</strong>  </p>
  
  <pre><code>IMSKU~AttributeID~Value~Unit~StoredValue~StoredUnit  
  1000006~16121~2-25~~~  
  1000006~3897~* McAfee Protection Suite~~~  
  1000006~3933~* 1yr Subscription~~~  
  1000010~1708~Feb 2011~~~  
  1000010~1710~Cisco~~0.00~  
  1000010~1711~http://www.cisco.com~~~  
  1000011~2852~1~~0.00~  
  1000011~2855~Light Cyan~~0.00~  
  1000012~2840~May 2010~~~  
  1000012~2842~HP~~0.00~  
  </code></pre>
  
  <p>I tried to load the text file as a table in sql as suggested by the users</p>
  
  <pre><code>&lt;?php  $con=mysqli_connect("localhost","username","pwd","db");
  // Check connection
  if (mysqli_connect_errno())
  {
  echo "Failed: " . mysqli_connect_error();
  }
  
  mysqli_query($con,"CREATE TABLE IF NOT EXISTS `add_features` (`id_product` INT(10) NOT NULL, `id_feature` INT(10) NOT NULL, `value` varchar(255),`unit` varchar(20),`s_value` varchar(20),`s_unit` varchar(20))");
  
  $sql = "LOAD DATA INFILE 'trial.txt'
  INTO TABLE `add_features`
  FIELDS TERMINATED BY '~'
  ";
  if ($con-&gt;query($sql) === TRUE) {
  echo "OK!";
  } else {
  echo "Error: " . $sql . "&lt;br&gt;" . $con-&gt;error;
  } 
  $result = mysqli_query($con,"SELECT * FROM `add_features`");
  
  echo "&lt;table class='add_features'&gt;
  &lt;tr class='titles'&gt;
  &lt;th&gt;Product_id&lt;/th&gt;
  &lt;th&gt;feature_id&lt;/th&gt;
  &lt;th&gt;value&lt;/th&gt;
  &lt;th&gt;Unit&lt;/th&gt;
  &lt;/tr&gt;";
  
  while($row = mysqli_fetch_array($result))
  {
  echo "&lt;tr&gt;";
  echo "&lt;td&gt;" . $row['id_product'] . "&lt;/td&gt;";
  echo "&lt;td&gt;" . $row['id_feature'] . "&lt;/td&gt;";
  echo "&lt;td&gt;" . $row['value'] . "&lt;/td&gt;";
  echo "&lt;td&gt;" . $row['unit'] . "&lt;/td&gt;";
  echo "&lt;/tr&gt;";
  }
  echo "&lt;/table&gt;";
  
  mysqli_close($con);
  ?&gt;  
  </code></pre>
  
  <p>But i am getting an error<br>
      Error: LOAD DATA INFILE 'trial.txt' INTO TABLE <code>add_features</code> FIELDS TERMINATED BY '~'   </p>