PHP readfile? ????? ??? ?? ?? ?? ??? ?? ? ???? PHP ?????? ??? ?????.

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??:

readfile ( string $file_name [, boolean $path = FALSE [, resource $context ]] ) : int

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• ?? ??:??? ?? ??? ???? ?? ?????.
• ??:???? ??? ?????? ??? ???? ??? ???? ?? ?? true ?? false? ??? ? ?? ?? ????.
• context:??? ?? ??? ????? ???? ? ???? ?? ????? ???. ????? ????? ?? ???? ??? ??? ? ?? ?? ?????. ???? ???? ?? ??? ?? ????, ?? ??? false? ?????.

PHP ?? ?? ??

readfile() ?? ??? ??? ?? ??? ??? ???? ? ??? ? ?? ?? ??? ??? ????.

1. ??()

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??:

file?(?string?$file_name?[,?int?$flag?= 0?[,?resource?$context?]] ) :?array

??? file_name? ?? ??? ?????. ???? ?? ???? ??? ? ?? ??? ?????.

• FILE_USE_INCLUDE_PATH:???? ???? ?? ??? ?????.
• FILE_IGNORE_NEW_LINES:?? ?? ??? ???? ? ?? ?????.
• FILE_SKIP_EMPTY_LINES:?? ?? ?????.

???? ??? ?? ??? ????, ???? false? ?????.

2. fopen()

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fopen?(?string?$file_name?,?string?$mode?[,?bool?$use_include_path?=?FALSE?[,?resource?$context?]] ) :?resource

• ??? file_name? URL?? PHP? ???? ???(????? ?)? ?????. PHP? ?????? ??? ? ?? ??? ???? ? ??? ?? ??? ??? ?? ?? ?? ?? file_name?? ?? ?????.
• file_name? ?? ??? ?? PHP? ?? ???? ??? ???? ??? ????? ?????. ?? ???? ??? ??? ??? ???? PHP? ?? ??? ???? ? ????.
• ??? file_name? ??? ?????? ?? ????? ???? URL? ??? ?? ? ?? PHP? ??_url_fopen? ??????? ?????. ?????? ??? ???? ?????.

??:?? ????? ???? ???? ? ??? ??? ??? ?????.'? ??? ? ?? ??? ?????.

• r – ?? ?? ??
• r+ – ?? ? ?? ??
• w – ?? ???

???? ?? ??? ???? ???? ???? false? ?????.

3. ???()

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??:

fread?(?resource?$handle?,?int?$length?) :?string

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?? ?? ? ??? ??? ??? ??? ????. length(???)? ??? ??, EOF? ????, ?? ?? ??? ?????. fgets(), fscanf(), ftell(), fwrite(), fopen(), fsockopen()? PHP?? ?? ??? ???? ? ?? ?? ?????.

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?? #1

??:

<?php
// it is writing content of file to output
// buffer used in readfile() function
echo readfile("file.txt");
?>

??:

?? ??? ???? ??? ?? ???? ?? ?????. readfile() ??? ?? ??? ??? ?? ??? ???? ?? ??? ?? ??? ??? ??????. readfile() ??? ???? ??? ??? ?? ??? ?????.

?? #2

??:

<?php
/ file contents written on output
// buffer by readfile() function
$file = @readfile("file.txt");
if (!$file)
{
print "File could not be opened";
}
?>

??:

?? ??? ??? ??? ?? ??? ??????. ? ???? ?? ??? ???? ??? ??? ?? ???? ??? ???????. ??? ??? ???? if ?? ???? ?????.

?? #3

??:

<?php
$file_name = "file.txt";
$fh = fopen($file_name, 'r');
$data = fread($fh, filesize($file_name));
fclose($fh);
echo $data;
?>

??:

In this example, we are combining the use of multiple file read functions. As in all the above examples, first, we are giving the file name which needs to be read from. Then the mode of operation, ‘r’ is given to them indicating it can only be read. filesize() function takes the filename and returns the size of the file along with its data and assigns it to $data variable. By using fclose() function we are closing that file. Finally, the data is printed as output.

Example #4

Code:

<?php
$file_name = "file.txt";
$file = fopen( $file_name , "r" );
if( $file == false ) {
echo ( "Error in opening file" );
exit();
}
$size = filesize( $file_name );
$filetext = fread( $file, $size);
fclose( $file );
echo ( "The size of input file in bytes is : $size\n" );
echo ("Printing details of file:\n");
echo ( $filetext );
?>

Output:

Before running the code, make sure that the file to be read file.txt is created in the local file path. In this example first, we are declaring the file name to be read and opening that with the function fopen(). Suppose the file does not exist, using if condition we are throwing an error message. Finally, we are printing the file size and the content present in the input file.

Conclusion

As seen from all the above examples, readfile() is one of the main functions of PHP used for reading the file name specified in this function. Apart from readfile() we have covered a few other file operations which perform similar actions such as fopen, file, fread, fgets, fgetss, ftell, etc. A combination of all of these are basically used in accessing and performing operations on the input file.

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