PHP and non-existing constructors.

Written by Johannes on June 3, 2012 Categories: php

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I just found a nice (or lets say not so nice) unexpected behavior in PHP. Apparently anything goes with constructors.

Calling a constructor that hadn’t been defined did not throw any kind of exception, error, warning, whatsoever.

So the following example executes:

class TestClass {
  public function testFunction() {
    return "Hello World!";
$testClass = new TestClass ("blabla"); // should report an error
echo $testClass->testFunction(); // Hello World

Update: Apparently there is a rationale behind this: the PHP function func_get_arg() allows shell style retrieval of function arguments.

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