chdir

(PHP 4, PHP 5, PHP 7, PHP 8)

chdir — 改变目录

说明

chdir(string $directory): bool

将 PHP 的当前目录改为 directory。

参数

directory: 新的当前目录

返回值

成功时返回 true，或者在失败时返回 false。

错误／异常

Throws an error of level E_WARNING on failure.

示例

示例 #1 chdir() 例子

<?php

// current directory
echo getcwd() . "\n";

chdir('public_html');

// current directory
echo getcwd() . "\n";

?>

以上示例的输出类似于：

/home/vincent
/home/vincent/public_html

注释

警告

If the PHP interpreter has been built with ZTS (Zend Thread Safety) enabled, any changes to the current directory made through chdir() will be invisible to the operating system. All built-in PHP functions will still respect the change in current directory; but external library functions called using FFI will not. You can tell whether your copy of PHP was built with ZTS enabled using php -i or the built-in constant PHP_ZTS.

参见

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nesk at xakep dot ru ¶

4 years ago

When working with FFI under a PHP ZTS environment, there is no standard way to change the directory with libraries (dll/so/dylib/etc), so to get around this problem, you should use something like this polyfill:

<?php

$directory = 'path/to/libraries';

switch (\PHP_OS_FAMILY) {
    case 'Windows':
        \FFI::cdef('extern unsigned char SetDllDirectoryA(const char* lpPathName);', 'kernel32.dll')
            ->SetDllDirectoryA($directory)
        ;
        break;

    case 'Linux':
    case 'BSD':
        \FFI::cdef('int setenv(const char *name, const char *value, int overwrite);')
            ->setenv('LD_LIBRARY_PATH', $directory, 1)
        ;
        break;

    case 'Darwin':
        \FFI::cdef('int setenv(const char *name, const char *value, int overwrite);')
            ->setenv('DYLD_LIBRARY_PATH', $directory, 1)
        ;
        break;
}

?>