Home Backend Development PHP Tutorial 发现一有趣儿的东东,该如何解决

发现一有趣儿的东东,该如何解决

Jun 13, 2016 pm 01:53 PM
exists file string

发现一有趣儿的东东
检查文件是否存在(这个函数很有趣)

bool file_exists ( string filename )

如果由 filename 指定的文件或目录存在则返回 TRUE,否则返回 FALSE。

这个函数很趣,在WIN上,如果你把文件设置为了没有文件名的文件(即像:.httpaccess之类的文件)或者隐藏了某个文件,它就对该文件不“感兴趣” 了,file_exists会认为这个文件不存在(它是文件确实有的),我想这也是出于安全的原因吧。PHP官网BBS上也谈论过个话题,有些人认为是一个BUG。但是这个函数的兄弟file_size就不一样了,如果你在用它来递归求某个文件夹大小时,会把你这个文件夹下的所有文件都计算在内(包括隐藏文件)。所你可以用file_exists函数来屏蔽这个现象!

------解决方案--------------------
哦!!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hongmeng native application random poetry Hongmeng native application random poetry Feb 19, 2024 pm 01:36 PM

To learn more about open source, please visit: 51CTO Hongmeng Developer Community https://ost.51cto.com Running environment DAYU200:4.0.10.16SDK: 4.0.10.15IDE: 4.0.600 1. To create an application, click File- >newFile->CreateProgect. Select template: [OpenHarmony] EmptyAbility: Fill in the project name, shici, application package name com.nut.shici, and application storage location XXX (no Chinese, special characters, or spaces). CompileSDK10, Model: Stage. Device

Use java's File.length() function to get the size of the file Use java's File.length() function to get the size of the file Jul 24, 2023 am 08:36 AM

Use Java's File.length() function to get the size of a file. File size is a very common requirement when dealing with file operations. Java provides a very convenient way to get the size of a file, that is, using the length() method of the File class. . This article will introduce how to use this method to get the size of a file and give corresponding code examples. First, we need to create a File object to represent the file we want to get the size of. Here is how to create a File object: Filef

How to convert php blob to file How to convert php blob to file Mar 16, 2023 am 10:47 AM

How to convert php blob to file: 1. Create a php sample file; 2. Through "function blobToFile(blob) {return new File([blob], 'screenshot.png', { type: 'image/jpeg' })} ” method can be used to convert Blob to File.

Convert basic data types to strings using Java's String.valueOf() function Convert basic data types to strings using Java's String.valueOf() function Jul 24, 2023 pm 07:55 PM

Convert basic data types to strings using Java's String.valueOf() function In Java development, when we need to convert basic data types to strings, a common method is to use the valueOf() function of the String class. This function can accept parameters of basic data types and return the corresponding string representation. In this article, we will explore how to use the String.valueOf() function for basic data type conversions and provide some code examples to

How to convert char array to string How to convert char array to string Jun 09, 2023 am 10:04 AM

Method of converting char array to string: It can be achieved by assignment. Use {char a[]=" abc d\0efg ";string s=a;} syntax to let the char array directly assign a value to string, and execute the code to complete the conversion.

Rename files using java's File.renameTo() function Rename files using java's File.renameTo() function Jul 25, 2023 pm 03:45 PM

Use Java's File.renameTo() function to rename files. In Java programming, we often need to rename files. Java provides the File class to handle file operations, and its renameTo() function can easily rename files. This article will introduce how to use Java's File.renameTo() function to rename files and provide corresponding code examples. The File.renameTo() function is a method of the File class.

Use Java's String.replace() function to replace characters (strings) in a string Use Java's String.replace() function to replace characters (strings) in a string Jul 25, 2023 pm 05:16 PM

Replace characters (strings) in a string using Java's String.replace() function In Java, strings are immutable objects, which means that once a string object is created, its value cannot be modified. However, you may encounter situations where you need to replace certain characters or strings in a string. At this time, we can use the replace() method in Java's String class to implement string replacement. The replace() method of String class has two types:

Use java's File.getParentFile() function to get the parent directory of the file Use java's File.getParentFile() function to get the parent directory of the file Jul 27, 2023 am 11:45 AM

Use java's File.getParentFile() function to get the parent directory of a file. In Java programming, we often need to operate files and folders. When we need to get the parent directory of a file, we can use the File.getParentFile() function provided by Java. This article explains how to use this function and provides code examples. File class in Java is the main class used to operate files and folders. It provides many methods to obtain and manipulate file properties

See all articles