PHP3 手冊
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each

each -- 傳回陣列中的下一對 key/value 值

Description

array each (array array);

Returns the current key/value pair from the array array and advances the array cursor. This pair is returned in a four-element array, with the keys 0 , 1 , key , and value . Elements 0 and key each contain the key name of the array element, and 1 and value contain the data.

Example 1. each() examples 

$foo = array( "bob", "fred", "jussi", "jouni" ); $bar = each( $foo );

$bar now contains the following key/value pairs:

  • 0 => 0

  • 1 => 'bob'

  • key => 0

  • value => 'bob' 

$foo = array( "Robert" => "Bob", "Seppo" => "Sepi" ); $bar = each( $foo );

$bar now contains the following key/value pairs:

  • 0 => 'Robert'

  • 1 => 'Bob'

  • key => 'Robert'

  • value => 'Bob'

each() is typically used in conjunction with list() to traverse an array; for instance, $HTTP_POST_VARS:

Example 2. Traversing $HTTP_POST_VARS with each() 

echo "Values submitted via POST method:<br>"; 
while ( list( $key, $val ) = each( $HTTP_POST_VARS ) ) {    
	echo "$key => $val<br>"; 
}

See also key() , list() , current() , reset() , next() , and prev() .

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