# Phar::offsetExists

(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL phar >= 1.0.0)

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

### 说明

public Phar::offsetExists(string `$localName`): 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

`localName`

  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.

### 示例

示例 #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']));
?>`

以上示例会输出：

    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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