Function try_fopen

Safely opens a PHP stream resource using a filename.

When fopen fails, PHP normally raises a warning. This function adds an error handler that checks for errors and throws an exception instead.

Namespace: GuzzleHttp\Psr7
Located at src/functions.php

Parameters summary
`string`	`$filename`	File to open
`string`	`$mode`	Mode used to open the file

Return value summary
`resource`	resource

Thrown exceptions summary
`RuntimeException`	if the file cannot be opened