property_exists(3) [php man page]

PROPERTY_EXISTS(3)							 1							PROPERTY_EXISTS(3)

property_exists - Checks if the object or class has a property

SYNOPSIS

       bool property_exists (mixed  $class, string  $property)

DESCRIPTION

	This function checks if the given $property exists in the specified class.

       Note

	       As opposed with isset(3), property_exists(3) returns TRUE even if the property has the value NULL.

PARAMETERS

	      o $class
		- The class name or an object of the class to test for

	      o $property
		- The name of the property

RETURN VALUES

	Returns TRUE if the property exists, FALSE if it doesn't exist or NULL in case of an error.

NOTES

       Note

	      Using this function will use any registered autoloaders if the class is not already known.

       Note

	       The property_exists(3) function cannot detect properties that are magically accessible using the __get magic method.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  This function checks the existence of a property |
       |	| independent of accessibility. 		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A property_exists(3) example

	      <?php

	      class myClass {
		  public $mine;
		  private $xpto;
		  static protected $test;

		  static function test() {
		      var_dump(property_exists('myClass', 'xpto')); //true
		  }
	      }

	      var_dump(property_exists('myClass', 'mine'));   //true
	      var_dump(property_exists(new myClass, 'mine')); //true
	      var_dump(property_exists('myClass', 'xpto'));   //true, as of PHP 5.3.0
	      var_dump(property_exists('myClass', 'bar'));    //false
	      var_dump(property_exists('myClass', 'test'));   //true, as of PHP 5.3.0
	      myClass::test();

	      ?>

SEE ALSO

       method_exists(3).

PHP Documentation Group 													PROPERTY_EXISTS(3)

SPLFIXEDARRAY(3)							 1							  SPLFIXEDARRAY(3)

The SplFixedArray class

INTRODUCTION

	The SplFixedArray class provides the main functionalities of array. The main differences between a SplFixedArray and a normal PHP array is
       that the SplFixedArray is of fixed length and allows only integers within the range as indexes. The advantage is that it  allows  a  faster
       array implementation.

CLASS SYNOPSIS

       SplFixedArray

       SplFixedArrayIteratorArrayAccessCountable

       Methods

       o public SplFixedArray::__construct ([int  $size])

       o public int SplFixedArray::count (void	)

       o public mixed SplFixedArray::current (void  )

       o publicstatic SplFixedArray SplFixedArray::fromArray (array  $array, [bool  $save_indexes = true])

       o public int SplFixedArray::getSize (void  )

       o public int SplFixedArray::key (void  )

       o public void SplFixedArray::next (void	)

       o public bool SplFixedArray::offsetExists (int  $index)

       o public mixed SplFixedArray::offsetGet (int  $index)

       o public void SplFixedArray::offsetSet (int  $index, mixed  $newval)

       o public void SplFixedArray::offsetUnset (int  $index)

       o public void SplFixedArray::rewind (void  )

       o public int SplFixedArray::setSize (int  $size)

       o public array SplFixedArray::toArray (void  )

       o public bool SplFixedArray::valid (void  )

       o public void SplFixedArray::__wakeup (void  )

EXAMPLES

       Example #1

	      SplFixedArray usage example

	      <?php
	      // Initialize the array with a fixed length
	      $array = new SplFixedArray(5);

	      $array[1] = 2;
	      $array[4] = "foo";

	      var_dump($array[0]); // NULL
	      var_dump($array[1]); // int(2)

	      var_dump($array["4"]); // string(3) "foo"

	      // Increase the size of the array to 10
	      $array->setSize(10);

	      $array[9] = "asdf";

	      // Shrink the array to a size of 2
	      $array->setSize(2);

	      // The following lines throw a RuntimeException: Index invalid or out of range
	      try {
		  var_dump($array["non-numeric"]);
	      } catch(RuntimeException $re) {
		  echo "RuntimeException: ".$re->getMessage()."
";
	      }

	      try {
		  var_dump($array[-1]);
	      } catch(RuntimeException $re) {
		  echo "RuntimeException: ".$re->getMessage()."
";
	      }

	      try {
		  var_dump($array[5]);
	      } catch(RuntimeException $re) {
		  echo "RuntimeException: ".$re->getMessage()."
";
	      }
	      ?>

	      The above example will output:

	      NULL
	      int(2)
	      string(3) "foo"
	      RuntimeException: Index invalid or out of range
	      RuntimeException: Index invalid or out of range
	      RuntimeException: Index invalid or out of range

PHP Documentation Group 													  SPLFIXEDARRAY(3)