var_dump(3) [php man page]

VAR_DUMP(3)								 1							       VAR_DUMP(3)

var_dump - Dumps information about a variable

SYNOPSIS

       void var_dump (mixed  $expression, [mixed  $...])

DESCRIPTION

	This  function	displays  structured  information  about  one or more expressions that includes its type and value. Arrays and objects are
       explored recursively with values indented to show structure.

	All public, private and protected properties of objects will be returned in the output unless the object implements a __debugInfo() method
       (implemented in PHP 5.6.0).

       Tip

	      As  with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of
	      this function, and save it in a string (for example).

PARAMETERS

	      o $expression
		- The variable you want to dump.

RETURN VALUES

	No value is returned.

EXAMPLES

       Example #1

	      var_dump(3) example

	      <?php
	      $a = array(1, 2, array("a", "b", "c"));
	      var_dump($a);
	      ?>

	      The above example will output:

	      array(3) {
		[0]=>
		int(1)
		[1]=>
		int(2)
		[2]=>
		array(3) {
		  [0]=>
		  string(1) "a"
		  [1]=>
		  string(1) "b"
		  [2]=>
		  string(1) "c"
		}
	      }

	      <?php

	      $b = 3.1;
	      $c = true;
	      var_dump($b, $c);

	      ?>

	      The above example will output:

	      float(3.1)
	      bool(true)

SEE ALSO

       print_r(3), debug_zval_dump(3), var_export(3), __debugInfo().

PHP Documentation Group 													       VAR_DUMP(3)

ARRAYACCESS(3)								 1							    ARRAYACCESS(3)

The ArrayAccess interface

INTRODUCTION

	Interface to provide accessing objects as arrays.

INTERFACE SYNOPSIS

       ArrayAccess

       ArrayAccess

       Methods

       o abstractpublic boolean ArrayAccess::offsetExists (mixed  $offset)

       o abstractpublic mixed ArrayAccess::offsetGet (mixed  $offset)

       o abstractpublic void ArrayAccess::offsetSet (mixed  $offset, mixed  $value)

       o abstractpublic void ArrayAccess::offsetUnset (mixed  $offset)

       Example #1

	      Basic usage

	      <?php
	      class obj implements ArrayAccess {
		  private $container = array();

		  public function __construct() {
		      $this->container = array(
			  "one"   => 1,
			  "two"   => 2,
			  "three" => 3,
		      );
		  }

		  public function offsetSet($offset, $value) {
		      if (is_null($offset)) {
			  $this->container[] = $value;
		      } else {
			  $this->container[$offset] = $value;
		      }
		  }

		  public function offsetExists($offset) {
		      return isset($this->container[$offset]);
		  }

		  public function offsetUnset($offset) {
		      unset($this->container[$offset]);
		  }

		  public function offsetGet($offset) {
		      return isset($this->container[$offset]) ? $this->container[$offset] : null;
		  }
	      }

	      $obj = new obj;

	      var_dump(isset($obj["two"]));
	      var_dump($obj["two"]);
	      unset($obj["two"]);
	      var_dump(isset($obj["two"]));
	      $obj["two"] = "A value";
	      var_dump($obj["two"]);
	      $obj[] = 'Append 1';
	      $obj[] = 'Append 2';
	      $obj[] = 'Append 3';
	      print_r($obj);
	      ?>

	      The above example will output something similar to:

	      bool(true)
	      int(2)
	      bool(false)
	      string(7) "A value"
	      obj Object
	      (
		  [container:obj:private] => Array
		      (
			  [one] => 1
			  [three] => 3
			  [two] => A value
			  [0] => Append 1
			  [1] => Append 2
			  [2] => Append 3
		      )

	      )

PHP Documentation Group 													    ARRAYACCESS(3)