rfc:array_column

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rfc:array_column [2013/01/12 17:17] – Added Example #4 ramseyrfc:array_column [2013/01/12 17:42] – ramsey
Line 1: Line 1:
 ====== Request for Comments: array_column ====== ====== Request for Comments: array_column ======
  
-  * Version: 2.2+  * Version: 2.3
   * Date: 2013-01-11   * Date: 2013-01-11
   * Author: Ben Ramsey <ramsey@php.net>   * Author: Ben Ramsey <ramsey@php.net>
Line 64: Line 64:
         'first_name' => 'Jane',         'first_name' => 'Jane',
         'last_name' => 'Jones'         'last_name' => 'Jones'
 +    ),
 +    array(
 +        'id' => 5623,
 +        'first_name' => 'Peter',
 +        'last_name' => 'Doe'
     )     )
 ); );
Line 79: Line 84:
     [1] => Sally     [1] => Sally
     [2] => Jane     [2] => Jane
 +    [3] => Peter
 ) )
 </code> </code>
Line 111: Line 117:
 <code php> <code php>
 <?php <?php
-// Array representing a possible record set returned from a database +// Using the $records array from Example #1
-$records = array( +
-    array( +
-        'id' => 2135, +
-        'first_name' => 'John', +
-        'last_name' => 'Doe' +
-    ), +
-    array( +
-        'id' => 3245, +
-        'first_name' => 'Sally', +
-        'last_name' => 'Smith' +
-    ), +
-    array( +
-        'id' => 5342, +
-        'first_name' => 'Jane', +
-        'last_name' => 'Jones' +
-    ) +
-); +
 $lastNames = array_column($records, 'last_name', 'id'); $lastNames = array_column($records, 'last_name', 'id');
 print_r($lastNames); print_r($lastNames);
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     [3245] => Smith     [3245] => Smith
     [5342] => Jones     [5342] => Jones
 +    [5623] => Doe
 ) )
 </code> </code>
Line 213: Line 202:
     [0] => bar     [0] => bar
     [1] => garply     [1] => garply
 +)
 +*/
 +</code>
 +
 +=== Example #5: indexKey Collisions ===
 +
 +In the event that more than one row contains the same value for //**indexKey**//, then the last //**columnKey**// value for that //**indexKey**// will overwrite the previous value.
 +
 +<code php>
 +// Using the $records array from Example #1
 +$firstNames = array_column($records, 'first_name', 'last_name');
 +print_r($firstNames);
 +
 +/*
 +Array
 +(
 +    [Doe] => Peter
 +    [Smith] => Sally
 +    [Jones] => Jane
 ) )
 */ */
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   * 2.1 (2013-01-11): Adding link to new pull request: https://github.com/php/php-src/pull/257   * 2.1 (2013-01-11): Adding link to new pull request: https://github.com/php/php-src/pull/257
   * 2.2 (2013-01-11): Opened voting   * 2.2 (2013-01-11): Opened voting
 +  * 2.3 (2013-01-12): Updates to the RFC (new examples, etc.), based on mailing list feedback
rfc/array_column.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

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