Detailed explanation of examples of file operations in php

Add utf-8 in php:

1 header("Content-type:text/ html;charset='UTF-8'");

File operation steps:

1. Create in the same directory A folder of file.txt

2. Open the file

1 $res = fopen("file.txt","r");//Open the file path. After opening, it is a resource and needs further processing;//r It means read-only

3. Read the file

$str= fread($res,300);//第二个参数为读取的长度(每个汉字的长度为3)$str = fread($res,filesize("file.txt"));//filesize读取文件大小
//以上二者选其一显示echo $str;

4.Close File

fclose($res);//读取完毕后,关闭资源

Reading of multi-line sentences:

1. Set the text to Can read and write, and write multi-line text

2. Read one line or read multiple lines

<span style="font-size: 16px"><span style="color: #008080">1 //打开文件<br>2</span> <span style="color: #800080">$res2</span> = <span style="color: #008080">fopen</span>("file.txt","r"<span style="color: #000000">);</span><span style="color: #008080">3</span> <span style="color: #800080">$str2</span> = <span style="color: #008080">fgets</span>(<span style="color: #800080">$res2</span>);<span style="color: #008000">//</span><span style="color: #008000">到此出现第一行</span><span style="color: #008080">4</span> <span style="color: #0000ff">echo</span> <span style="color: #800080">$str2</span>."<br>";<span style="color: #008000">//</span><span style="color: #008000">换行</span><span style="color: #008080">5</span> <span style="color: #800080">$str2</span> = <span style="color: #008080">fgets</span>(<span style="color: #800080">$res2</span><span style="color: #000000">);</span><span style="color: #008080">6</span> <span style="color: #0000ff">echo</span> <span style="color: #800080">$str2</span>;<span style="color: #008000">//</span><span style="color: #008000">到此出现第二行<br>7 //使用while循环可以使其全部显示(如下)<br>8 while($str2 = fgets($res2)) {<br>9　　　echo $str2."<br>";<br>10 }<br>11 //关闭文件<br>12 fclose($res2);<br></span></span>

The file() function reads the file into an array, with each element separated by a newline character:

1 $arr = file("file.txt");2 print_r($arr);3 echo "

";4 for($i = 0;$i ";6 }7 echo "

".$arr[$i]."

";

The file_get_contents() function reads the file contents into a string (Able to achieve cross-domain reading):

1 $str4 = file_get_contents("http://www.jd.com");//可以跨域2 echo $str4;

***file_put_contents() function writes a string to a file, and Calling fopen(), fwrite(), fclose() in sequence has the same function;

1 $bol = file_put_contents("file.txt","我爱你");//后面的内容可以将前面内容全部覆盖2 echo $bol;

***is_file determines whether the file exists

1 $bol = is_file("file3.txt");//判断file3.txt是否存在2 echo $bol;

Statistics website pv (number of visits) through the above mark (***):

 1 //首先判断有没有统计的文件 2 if(is_file("pv.txt")) {//有 3     //取文件里面的值 4     $res = file_get_contents("pv.txt"); 5     //累加 6     $res += 1; 7     //类加后的值存进去 8     file_put_contents("pv.txt",$res); 9     //输出pv数10     echo file_get_contents("pv.txt");11     }else {//没有统计的文件12     //创建文件,同时给文件里一个初始值13     file_put_contents("pv.txt",1);14     //输出一下当前的pv是:115     echo file_get_contents("pv.txt");16 }

Copy of the file copy

 copy("pv.txt","pv2.txt");

File rename rename

rename("pv2.txt","pv5.txt");

Delete File unlink

 unlink("pv5.txt");

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