获取PHP中所有打开的资源句柄

Question

I have been working with a PHP application, which uses the methods fopen and ftp_connect a lot. One of the servers where the application is running throw a Fatal Exception , when too many files are opened, Hence I needed to find all classes which used that methods and refactored them so that they close the file handles afterwards with fclose and ftp_close .

By doing this I wanted to add an integration test afterwards which tracks down all opened resources so that something like this would not happen again.

Is there a way to do this in PHP?

Answer 1

You can obtain desired result using get_defined_vars() , gettype() and — optionally — get_resource_type() :

$resources = array();

foreach( get_defined_vars() as $key => $val )
{
    if( 'resource' == gettype( $val ) )
    {
        $resources[ get_resource_type( $val ) ][] = $key;
    }
}

foreach( $resources as $type => $res )
{
    echo sprintf( '%- 20s: % 3d%s', $type, count($res), PHP_EOL );
}

Assuming you have these opened resources:

$handle = fopen( '/Your/File/Path' );
$ftp1   = ftp_connect ( 'ftp.site1.com' );
$ftp2   = ftp_connect ( 'ftp.site2.com' );

Above code will output:

stream              :   1
FTP Buffer          :   2

Answer 2

PHP 7.0.0引入了一个获取资源的函数，名为get_resources() 。