PHP script to create file if no exist -

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i have small problem php code. please take look:

<?php  $urlud = $json['url'];  $content = 'content 1 if file no exist generate';  $filename = $json['id'].".html";  if (file_exists($filename)) {      echo "file exists!";  } else {      file_put_contents('dir1/'. $filename, $content, file_append | lock_ex);  }  ?>  <?php  $urlud = $json['url'];  $content = 'content 2 if file no exist generate';  $filename = $json['id'].".html";  if (file_exists($filename)) {      echo "file exists!";  } else {      file_put_contents('dir2/'. $filename, $content, file_append | lock_ex);  }  ?>

this code generate 2 files in different directories different content. problem is:

  1. this code keeps replacing old file content. solution make create if file doesn't exist ?
  2. any other input make code simpler?

thanks.

if (file_exists('dir1/'. $filename))

and 

if (file_exists('dir2/'. $filename))

you have check full path of file not file name. e.g. imagine $filename "readme.txt" file not existing in script path. , expect in dir1 or dir2.


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