1--TEST-- 2Test symlink(), linkinfo(), link() and is_link() functions : usage variations - access/update file through hard link 3--FILE-- 4<?php 5/* Prototype: bool symlink ( string $target, string $link ); 6 Description: creates a symbolic link to the existing target with the specified name link 7 8 Prototype: bool is_link ( string $filename ); 9 Description: Tells whether the given file is a symbolic link. 10 11 Prototype: bool link ( string $target, string $link ); 12 Description: Create a hard link 13 14 Prototype: int linkinfo ( string $path ); 15 Description: Gets information about a link 16*/ 17 18/* Variation 4 : Create file and a hard link to the file 19 Access data of the file through the hard link 20 Update the file through hard link 21 Check size of file and hard link 22*/ 23$file_path = __DIR__; 24 25echo "*** Accessing and updating data of file through hard link ***\n"; 26// Creating file and inserting data into it 27$filename = "$file_path/symlink__link_linkinfo_is_link_variation4.tmp"; 28// create temp file 29$file = fopen($filename, "w"); 30// fill data into file 31fwrite($file, str_repeat("text", 20) ); 32fclose($file); 33 34echo "\n-- Access data of the file through the hard link --\n"; 35// create hard link to file 36$linkname = "$file_path/symlink_link_linkinfo_is_link_link_variation4.tmp"; 37var_dump( link($filename, $linkname) ); 38$data_from_link = file_get_contents($linkname); // data read from $filename 39var_dump( $data_from_link ); 40 41echo "\n-- Check size of hard link and file --\n"; 42if( filesize($filename) == filesize($linkname) ) 43 echo "\nSize of file and hard link are same\n"; 44else 45 echo "\nWarning: Size of file and hard link differ\n"; 46 47echo "\n-- Updating file with data through hard link --\n"; 48// append link with data 49$fp = fopen($linkname, "a"); // open in append mode 50fwrite($fp, "Hello World"); 51fclose($fp); 52 53// now check temp file for data; it should append "Hello World" 54$data_from_file = file_get_contents($filename); 55var_dump( $data_from_file ); 56 57echo "\n-- Check size of hard link and file --\n"; 58if( filesize($filename) == filesize($linkname) ) 59 echo "\nSize of file and hard link are same\n"; 60else 61 echo "\nWarning: Size of file and hard link differ\n"; 62 63echo "\n-- Updating file with data and check data through hard link --\n"; 64// write to temp file 65$file = fopen($filename, "w"); 66fwrite($file, "Hello World"); 67fclose($file); 68 69// now check link for data; it should echo "Hello World" 70$data_from_link = file_get_contents($linkname); 71var_dump( $data_from_link ); 72 73echo "\n-- Check size of hard link and file --\n"; 74var_dump( filesize($filename) ); 75var_dump( filesize($linkname) ); 76if( filesize($filename) == filesize($linkname) ) 77 echo "\nSize of file and hard link are same\n"; 78else 79 echo "\nWarning: Size of file and hard link differ\n"; 80 81// delete the link 82unlink($linkname); 83// delete the temporary file 84unlink($filename); 85 86echo "Done\n"; 87?> 88--EXPECT-- 89*** Accessing and updating data of file through hard link *** 90 91-- Access data of the file through the hard link -- 92bool(true) 93string(80) "texttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttext" 94 95-- Check size of hard link and file -- 96 97Size of file and hard link are same 98 99-- Updating file with data through hard link -- 100string(91) "texttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttexttextHello World" 101 102-- Check size of hard link and file -- 103 104Size of file and hard link are same 105 106-- Updating file with data and check data through hard link -- 107string(11) "Hello World" 108 109-- Check size of hard link and file -- 110int(11) 111int(11) 112 113Size of file and hard link are same 114Done 115
