File operations and directory operations in PHP
file_get_countents
file_get_contents($filename); // Get the content of a file or the content of a network resource.
A relatively fast function for reading files and network resources, helping to encapsulate the opening /Close and other operations.
Disadvantages: This function reads out all the contents at once and puts them in memory. Therefore, if you are dealing with large files of hundreds of megabytes, use this function with caution. The file to be read must exist, otherwise a warning will be issued
<?php
$fileFile = './a.txt';
$fileCoutent = file_get_contents($fileFile);
echo $fileCoutent;
echo file_get_contents('http://www.linxingzhang.com');
?>file_put_counents
file_put_contents($filename, $data); This function is used to write content to a file, a shortcut function that helps encapsulate the details of opening and writing
<?php file_put_contents('./b.txt', '嘻嘻哈哈'); ?>
Determine the data type
isset(); Whether the variable has been declared
empty(); Whether the variable is empty
defined(); Whether the constant has been defined define();
array_key_exists(mixed key, array serach); Check the given key Whether the name or index exists in the array
is_numeric(mixed var); Check whether the given key name or index exists in the array
is_bool(); Check whether the variable is Boolean
is_float(); Check whether the variable is float Point type has the same usage as is_double(), is_real()
is_int(); detects whether the variable is an integer. is_integer() has the same usage
is_string(); detects whether the variable is a string
is_object(); detects whether the variable Is an object
is_array(); Check whether the variable is an array
is_null(); Check whether the variable is NULL
fopen&fread&fwrite&fclose
fopen($filename, $mode)
Parameter 1: path
Parameter 2: Mode such as: read-only Mode, such as: read-write mode, such as: append mode
Open a file and return a handle resource
Return value: resource. (The role of the channel is to operate the file along the channel. Obtain the qualification to modify this file)
fread($handle, $length)
Parameter 1: Resource ID
Parameter 2: The read length
Return value: all Read string
Read file
fwrite($handle, $string);
Parameter 1: Resource identifier
Parameter 2: Content
Return value: Successful string number, failure returns false
Write file
fclose ($handle); Close the resource
<?php
$file = './a.txt';
// 返回獲取資格的標(biāo)識
$fh = fopen($file, 'r');
// 沿著上面返回的$fn資源通道來讀文件
echo fread($fh, 10);
$rs = fwrite($fh, 'xixihaha');
echo $rs; // 0 // 只讀，不允許寫入
fclose($fh);
?><?php
$file = './a.txt';
// r+ 讀寫模式， 并把指針指向文件頭
// 覆蓋相等字節(jié)的字符串
$fh = fopen($file, 'r+');
$rs = fwrite($fh, 'hahahaha');
echo $rs;
echo '<hr />';
// w 寫入模式(fread讀取不了)， 并把文件大小截為0(文件被清空了)，指針停于開頭處
$file = './modew.txt';
$fh = fopen($file, 'w');
fclose($fh);
echo 'ok';
// a 追加模式 能寫，并把指針停止在文件的最后.
$fh = fopen('./modea.txt', 'a');
echo fwrite($fh, '嘻嘻哈哈');
fclose($fh);
?>file
Batch processing list
The first method:
<?php
$file = './custom.txt';
$cont = file_get_contents($file);
print_r( explode("\n", $cont) );
/**
* 各個操作系統(tǒng)下，換行符并不一致
* win: \r\n
* *nix: \n
* mac: \r
*/
?>The second method:
<?php
// 第二種
// 打開，一點(diǎn)點(diǎn)的讀取，每次讀取一行.
// fgets(); 每次讀取一行
$file = './custom.txt';
// $mode 可以加`b`,表示以2進(jìn)制來處理，不受編碼的干擾.
$fh = fopen($file, 'rb');
// feof(), end of file 的意思
// 判斷指針是否已經(jīng)到結(jié)尾
while ( !feof($fh) ) {
echo fgets($fh) , '<br />';
}
?>The third method:
file(); Directly read the file content , and split it into an array by line, and return the array.
The same as file_get_contents();: read in one time, use large files with caution.
<?php
// file();
$file = './custom.txt';
$arr = file($file);
print_r($arr);
?>file_exists
file_exists Check whether the file or directory exists file_exists($ filename);
<?php
// 判斷文件是否存在
// 獲取文件的創(chuàng)建時(shí)間/修改時(shí)間
$file = './custom.txt';
if ( file_exists($file) ) {
echo $file, '存在', '<br />';
echo '上次修改時(shí)間：', date('Y-m-d H:i:s', filemtime($file)), '<br />';
echo '修改時(shí)間：', date('Y-m-d H:i:s', filectime($file)), '<br />';
}
?>
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