hphp/test/zend/good/ext-standard-file/symlink_link_linkinfo_is_link_variation3.php

   1 <?php
   2 /* Prototype: bool symlink ( string $target, string $link );
   3    Description: creates a symbolic link to the existing target with the specified name link
   4
   5    Prototype: bool is_link ( string $filename );
   6    Description: Tells whether the given file is a symbolic link.
   7
   8    Prototype: bool link ( string $target, string $link );
   9    Description: Create a hard link
  10
  11    Prototype: int linkinfo ( string $path );
  12    Description: Gets information about a link
  13 */
  14
  15 /* Variation 3 : Create file and a soft link to the file
  16                  Access data of the file through the soft link
  17                  Update the file through soft link
  18                  Check size of file and soft link link
  19 */
  20
  21 $file_path = dirname(__FILE__);
  22 echo "*** Accessing and updating data of file through soft link ***\n";
  23 // Creating file and inserting data into it
  24 $filename = "$file_path/symlink_link_linkinfo_is_link_variation3.tmp";
  25
  26 // create temp file
  27 $file = fopen($filename, "w");
  28
  29 // create soft link to file
  30 $linkname = "$file_path/symlink_link_linkinfo_is_link_link_variation3.tmp";
  31 var_dump( symlink($filename, $linkname) );
  32 // storing size of symlink in a local variable
  33 $link_stat = lstat($linkname);  // lstat of link
  34 $link_size = $link_stat[7];  // size of soft link
  35
  36 // fill data into file
  37 fwrite($file, str_repeat("text", 20) );
  38 fclose($file);
  39
  40 echo "\n-- Access data of the file through the soft link --\n";
  41 $data_from_link = file_get_contents($linkname);  // data read from $filename
  42 var_dump( $data_from_link );
  43
  44 echo "\n-- Check size of soft link and file --\n";
  45 var_dump( filesize($filename) );
  46 var_dump( filesize($linkname) );
  47
  48 // taking lstat of symlink
  49 $stat = lstat($linkname);
  50 // checking that size of symlink remains same
  51 if ($link_size == $stat[7])
  52   echo "\nSoft link size remains same \n";
  53 else
  54   echo "\nWarning: Soft link size has changed \n";
  55
  56 echo "\n-- Updating file with data through soft link --\n";
  57 // append link with data
  58 $fp = fopen($linkname, "a");  // open in append mode
  59 fwrite($fp, "Hello World");
  60 fclose($fp);
  61
  62 // now check temp file for data; it should append "Hello World"
  63 $data_from_file = file_get_contents($filename);
  64 var_dump( $data_from_file );
  65
  66 echo "\n-- Check size of soft link and file --\n";
  67 var_dump( filesize($filename) );
  68 var_dump( filesize($linkname) );
  69
  70 // taking lstat of symlink
  71 $stat = lstat($linkname);
  72 // checking that size of symlink remains same
  73 if ($link_size == $stat[7])
  74   echo "\nSoft link size remains same \n";
  75 else
  76   echo "\nWarning: Soft link size has changed \n";
  77
  78 echo "\n-- Updating file with data and check data through soft link --\n";
  79 // write to temp file
  80 $file = fopen($filename, "w");
  81 fwrite($file, "Hello World");
  82 fclose($file);
  83
  84 // now check link for data; it should echo "Hello World"
  85 $data_from_link = file_get_contents($linkname);
  86 var_dump( $data_from_link );
  87
  88 echo "\n-- Check size of soft link and file --\n";
  89 var_dump( filesize($filename) );
  90 var_dump( filesize($linkname) );
  91
  92 // taking lstat of symlink
  93 $stat = lstat($linkname);
  94 // checking that size of symlink remains same
  95 if ($link_size == $stat[7])
  96   echo "\nSoft link size remains same \n";
  97 else
  98   echo "\nWarning: Soft link size has changed \n";
  99
 100 // delete the link
 101 unlink($linkname);
 102 // delete the temporary file
 103 unlink($filename);
 104
 105 echo "Done\n";
 106 ?>