PHPWithContextManager
Python-like context manager for PHP
#Why?
If you don't know what this is all about, checkout Python Context Managers. This just tries to mimic them.
#Installation
Download with.php and require it.
#Usage
Custom Context Managers
#!/usr/bin/env php
<?php
require('with.php');
class A {
public function _enter() {
echo "A is setting up stuff.\n";
}
public function _exit($exception) {
echo "A is cleaning up stuff.\n";
if(!empty($exception)) {
echo "I've handled the exception\n";
// Return true to say you've handled the exception.
// This will catch the exception.
return true;
}
}
}
class B {
public function _enter() {
echo "B is setting up stuff.\n";
// Return a value to pass it to the closure instead.
return 1;
}
public function _exit($exception) {
echo "B is cleaning up stuff.\n";
}
}
with(new A, new B, function($a, $b) {
// $a is an object, $b is the number 1
var_dump($a, $b);
throw new Exception('Something went wrong.');
echo "This should not be seen because of exception.\n";
});
// We get here because class A handles the exception.
echo "After with.\n";Output:
A is setting up stuff.
B is setting up stuff.
class A#1 (0) {
}
int(1)
A is cleaning up stuff.
I've handled the exception
B is cleaning up stuff.
After with.
Resources
If used with resources, they'll be closed when you're done, even if an exception was thrown.
with(fopen('data.txt', 'r'), function($handle) {
$data = fread($handle, 10);
});