PHP Manual
Phar
Determines whether a file exists in the phar

Phar::offsetExists

(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 1.0.0)

Phar::offsetExists — Determines whether a file exists in the phar

说明

public Phar::offsetExists ( string $offset ) : bool

This is an implementation of the ArrayAccess interface allowing direct manipulation of the contents of a Phar archive using array access brackets.

offsetExists() is called whenever isset() is called.

参数

offset: The filename (relative path) to look for in a Phar.

返回值

Returns TRUE if the file exists within the phar, or FALSE if not.

范例

Example #1 A Phar::offsetExists() example

 <?php
$p = new Phar(dirname(__FILE__) . '/my.phar', 0, 'my.phar');
$p['firstfile.txt'] = 'first file';
$p['secondfile.txt'] = 'second file';
// the next set of lines call offsetExists() indirectly
var_dump(isset($p['firstfile.txt']));
var_dump(isset($p['nothere.txt']));
?>

以上例程会输出：

bool(true)
bool(false)

参见

Phar::offsetGet() - Gets a PharFileInfo object for a specific file
Phar::offsetSet() - Set the contents of an internal file to those of an external file
Phar::offsetUnset() - Remove a file from a phar

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