in_array really loves typecast

By chx ~ Posted Mon, 12/05/2011 - 15:45

<?php
$a = array('7.1');
var_dump(in_array('7.10', $a));
?>

bool(true)
I have no explanation. Both are strings. Really: WTF?

»

More on array references

By chx ~ Posted Tue, 09/27/2011 - 10:25

<?php
function test(&$a) {}
test($x['foo']);
?>

Don't ask me, ever, why this doesn't throw a notice or two. It creates the $x array with a foo key assigned to NULL.

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PHP protected and an assault

By chx ~ Posted Sat, 09/10/2011 - 09:19

<?php
class Victim {
  protected $money = 100;

  public function __toString() {
    return (string) $this->money;
  }
}

class Offender extends Victim {
  function assault(Victim $victim) {
    $victim->money = 0;
  }
}

$victim = new Victim;
$offender = new Offender;
$offender->assault($victim);
print (string)$victim;
?>

»

PHP function calls returning references

By chx ~ Posted Sun, 06/05/2011 - 14:24

Let's say we have this function:

<?php
function &collector() {
  static $c = array();
  return $c;
}
?>

we can use this like the following (very familiar to D7 coders):
<?php
  // Note that $x = collector(); won't work.
  $x = &collector();
  $x[] = 'foo';
?>

Say you wanted to have one line code:
<?php
  array_push(&collector(), 'foo');
?>

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PHP function calls have quite some overhead

By chx ~ Posted Thu, 06/02/2011 - 17:30

Apparently $array === (array) $array is significantly faster than is_array($array) for very small arrays. I have posted a detailed benchmark script which seems to concur: for approximately 40-50 bytes, like an array containing 5-6 integers (I am on 64 bit) or 5-6 of 8 byte strings this tricky is definitely faster.

»

foreach and references

By chx ~ Posted Sun, 04/17/2011 - 02:32

Apparently this is not a bug and it's documented:

<?php
$array = array('foo', 'bar');
foreach ($array as &$foo);
foreach ($array as $foo);
var_dump($array);
?>

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Array reference always succeeds

By chx ~ Posted Thu, 07/08/2010 - 06:39

php -r 'var_dump($a["foo"]);var_dump(&$a["foo"]);var_dump($a);'

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Static properties and variable classnames

By chx ~ Posted Tue, 07/06/2010 - 20:13

Oh no!

<?php
class test {
  static public $foo = 'test1';
  static public $bar = 'test2';
  function foo() {
    print "method foo\n";
  }
}

class test1 {
  function __construct() {
    print "test1 constructor\n";
  }
}
class test2 {
  function __construct() {
    print "test2 constructor\n";
  }
}

function test1() {
  print "test1 function\n";
}
function test2() {
  print "test2 function\n";
}
function foo() {
  print "foo function\n";
  return 'bar';
}

$foo = 'foo';

$a = test::$foo;
new $a();
new test::$foo();
$a();
print test::$foo();
?>

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On class properties

By chx ~ Posted Tue, 07/06/2010 - 19:13

<?php
class foo  {
  static public $bar = 2;
}

print foo::$bar;
$n = new foo;
print $n->bar;
print $n->$bar;
?>

Results?

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_FILES array

By chx ~ Posted Sat, 03/13/2010 - 07:53

An <input type="file" name="foo"> produces this

<?php
array (
  'foo' =>
  array (
    'name' => '',
    'type' => '',
    'tmp_name' => '',
    'error' => 4,
    'size' => 0,
  ),
)
?>

$_FILES array. What do you think foo[bar] will produce?

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