How to check whether a file directory exists in php

Query method: 1. Use the is_file() function to determine whether the specified file exists and check whether it is a normal file. The syntax is "is_file($file)"; 2. Use the file_exists() function to determine whether the specified file exists and check whether it is a normal file. Whether the specified file exists or the specified directory exists, the syntax is "file_exists($file)"; 3. Use the is_dir() function to determine whether the specified directory exists, the syntax is "is_dir($file)".

The operating environment of this tutorial: Windows 7 system, PHP 8 version, DELL G3 computer

Determine whether the file or directory exists in PHP. Functions, you can use the is_file(), file_exists() and is_dir() functions to query whether a file directory exists.

Among them, the is_file() and file_exists() functions can determine whether the specified file exists; and the file_exists() and is_dir() functions can determine whether the specified directory exists.

is_file() function query and judgment

is_file determines whether the file exists and checks whether the specified file name is a normal file;

<?php
header("Content-type:text/html;charset=utf-8");
$file = "check.txt";
if(is_file($file))
{
    echo "当前目录中，文件".$file."存在";
}
else
{
     echo "当前目录中，文件".$file."不存在";
}
?>

file_exists() function query and judgment

file_exists determines whether the file exists or whether the directory exists;

Example 1: Determine whether the file exists

<?php
header("Content-type:text/html;charset=utf-8");
$file = "test.txt";
if(file_exists($file))
{
    echo "当前目录中，文件".$file."存在";
}
else
{
     echo "当前目录中，文件".$file."不存在";
}
?>

Example 2: Determine whether the directory exists

<?php
header("Content-type:text/html;charset=utf-8");
$file = "demo/";
if(file_exists($file))
{
    echo "目录".$file." 存在";
}
else
{
     echo "目录".$file."不存在";
}
?>

## is_dir () function query

is_dir determines whether the directory exists;

<?php
header("Content-type:text/html;charset=utf-8");
$file = "img/";
if(is_dir($file))
{
    echo "目录".$file." 存在";
}
else
{
     echo "目录".$file."不存在";
}
?>

Recommended learning: "

PHP Video Tutorial"

The above is the detailed content of How to check whether a file directory exists in php. For more information, please follow other related articles on the PHP Chinese website!