本文实例讲述了PHP实现的文件操作类及文件下载功能。分享给大家供大家参考，具体如下：
文件操作类：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 redistributed without charge // under the terms of the GNU General Public // License version 2.0 or later -- www.gnu.org // Subject to the retention of this copyright // and GPL Notice in all copies or derived works classcfile { //The path to the file we wish to work with. protected$thepath; //Error messages in the form of constants for ease of use. constFOUNDERROR ="Sorry, the file in question does not exist."; constPERMERROR ="Sorry, you do not have the proper permissions on this file"; constOPENERROR ="Sorry, the file in question could not be opened."; constCLOSEERROR ="Sorry, the file could not be closed."; //The constructor function. publicfunction__construct (){ $num_args= func_num_args(); if($num_args> 0){ $args= func_get_args(); $this->thepath =$args[0]; } } //A function to open the file. privatefunctionopenfile ($readorwrite){ //First, ensure the file exists. try{ if(file_exists($this->thepath)){ //Now, we need to see if we are reading or writing or both. $proceed= false; if($readorwrite=="r"){ if(is_readable($this->thepath)){ $proceed= true; } }elseif($readorwrite=="w"){ if(is_writable($this->thepath)){ $proceed= true; } }else{ if(is_readable($this->thepath) &&is_writable($this->thepath)){ $proceed= true; } } try{ if($proceed){ //We can now attempt to open the file. try{ if($filepointer=fopen($this->thepath,$readorwrite)){ return$filepointer; }else{ thrownewexception (self::OPENERROR); returnfalse; } }catch(exception$e) { echo$e->getmessage(); } }else{ thrownewexception (self::PERMERROR); } }catch(exception$e) { echo$e->getmessage(); } }else{ thrownewexception (self::FOUNDERROR); } }catch(exception$e) { echo$e->getmessage(); } } //A function to close a file. functionclosefile () { try{ if(!fclose ($this->thepath)){ thrownewexception (self::CLOSEERROR); } }catch(exception$e) { echo$e->getmessage(); } } //A function to read a file, then return the results of the read in a string. publicfunctionread () { //First, attempt to open the file. $filepointer=$this->openfile ("r"); //Now, return a string with the read data. if($filepointer!= false){ //Then we can read the file. returnfgets($filepointer); } //Lastly, close the file. $this->closefile (); } //A function to write to a file. publicfunctionwrite ($towrite) { //First, attempt to open the file. $filepointer=$this->openfile ("w"); //Now, return a string with the read data. if($filepointer!= false){ //Then we can read the file. returnfwrite ($filepointer,$towrite); } //Lastly, close the file. $this->closefile (); } //A function to append to a file. publicfunctionappend ($toappend) { //First, attempt to open the file. $filepointer=$this->openfile ("a"); //Now, return a string with the read data. if($filepointer!= false){ //Then we can read the file. returnfwrite ($filepointer,$toappend); } //Lastly, close the file. $this->closefile (); } //A function to set the path to a new file. publicfunctionsetpath ($newpath) { $this->thepath =$newpath; } } ?> 1 2 3 4 5 6 7 8 9 read(); //Then let"s try writing to the file. $myfile->write ("Hello World!"); //Then, let"s try appending. $myfile->append ("Hello Again!"); ?>文件下载：
1 2 3 4 5 6 7 8 9 10 11 12[php实现文件操作类及文件夹]PHP实现文件操作类及文件下载功能的教程
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