array(3) [php man page]

ARRAY(3)								 1								  ARRAY(3)

array - Create an array

SYNOPSIS

       array array ([mixed  $...])

DESCRIPTION

	Creates an array. Read the section on the array type for more information on what an array is.

PARAMETERS

	      o $...
		-  Syntax  "index  => values", separated by commas, define index and values. index may be of type string or integer. When index is
		omitted, an integer index is automatically generated, starting at 0. If index is an integer, next generated index will be the big-
		gest  integer  index  +  1. Note that when two identical index are defined, the last overwrite the first.  Having a trailing comma
		after the last defined array entry, while unusual, is a valid syntax.

RETURN VALUES

	Returns an array of the parameters. The parameters can be given an index with the => operator. Read the section on the array type for more
       information on what an array is.

EXAMPLES

	The following example demonstrates how to create a two-dimensional array, how to specify keys for associative arrays, and how to skip-and-
       continue numeric indices in normal arrays.

       Example #1

	      array(3) example

	      <?php
	      $fruits = array (
		  "fruits"  => array("a" => "orange", "b" => "banana", "c" => "apple"),
		  "numbers" => array(1, 2, 3, 4, 5, 6),
		  "holes"   => array("first", 5 => "second", "third")
	      );
	      ?>

       Example #2

	      Automatic index with array(3)

	      <?php
	      $array = array(1, 1, 1, 1,  1, 8 => 1,  4 => 1, 19, 3 => 13);
	      print_r($array);
	      ?>

	      The above example will output:

	      Array
	      (
		  [0] => 1
		  [1] => 1
		  [2] => 1
		  [3] => 13
		  [4] => 1
		  [8] => 1
		  [9] => 19
	      )

	Note that index '3' is defined twice, and keep its final value of 13. Index 4 is defined after index 8, and next  generated  index  (value
       19) is 9, since biggest index was 8.

	This example creates a 1-based array.

       Example #3

	      1-based index with array(3)

	      <?php
	      $firstquarter = array(1 => 'January', 'February', 'March');
	      print_r($firstquarter);
	      ?>

	      The above example will output:

	      Array
	      (
		  [1] => January
		  [2] => February
		  [3] => March
	      )

	As  in Perl, you can access a value from the array inside double quotes. However, with PHP you'll need to enclose your array between curly
       braces.

       Example #4

	      Accessing an array inside double quotes

	      <?php

	      $foo = array('bar' => 'baz');
	      echo "Hello {$foo['bar']}!"; // Hello baz!

	      ?>

NOTES

       Note

	      array(3) is a language construct used to represent literal arrays, and not a regular function.

SEE ALSO

       array_pad(3), list(3), count(3), range(3), foreach, The array type.

PHP Documentation Group 														  ARRAY(3)

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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)

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