PHP determines whether a file or directory (folder) exists_PHP tutorial

php determines whether a file or directory (folder) exists

The php library has its own function to determine whether a file or directory exists. file_exists determines whether a file exists, and is_dir determines a directory ( folder) exists. Specific examples are as follows:

$file='index.php';
$dir='www.phpernote.com/wwwroot/';
if(file_exists($dir.$file)){
	echo '文件'.$file.'存在';
}else{
	echo '文件'.$file.'不存在';
}
if(is_dir($dir)){
    echo '目录'.$dir.'存在';
}else{
    echo '目录'.$dir.'不存在';
}

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