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@ 2014-05-05T14:18:12Z

<?php
     
    $alist = array (
                array('Effective Supervisory', '18/07/1992', '19/07/1992'),
                array('Effective Supervisory', '16/08/1992', '16/08/1992'),
                array('Effective Supervisory', '19/08/1992', '19/08/1992'),
                array('Seven Habits', '19/09/1992', '19/09/1992'),
                array('Seven Habits', '20/09/1992', '20/09/1992'),
                array('Effective Supervisory', '29/08/1992', '29/08/1992'),
             );
     
     
    function searchForKeyValues($searchVal, $array) {
       $keys = array();
       $n = 0;
       foreach ($array as $key => $val) {
           if ($val[0] === $searchVal) {
               $keys[$n++] = $key;
           }
       }
       return $keys;
    }
     
    function getAllKeys($array, $arrayCol) {
     
       $keys = array();
       $n = 0;
       foreach ($array as $key => $val) {
           $keys[$n++] = $val[$arrayCol];
       }
       return array_unique($keys);
     
    }
     
    $allKeys = getAllKeys($alist, 0);
    var_dump($allKeys);
     
    foreach ($allKeys as $searchVal) {
        echo "Searching for '$searchVal' :\n";
        var_dump(searchForKeyValues($searchVal, $alist));
    }
     
    ?>

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [0]=> string(21) "Effective Supervisory" [3]=> string(12) "Seven Habits" } Searching for 'Effective Supervisory' : array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> int(5) } Searching for 'Seven Habits' : array(2) { [0]=> int(3) [1]=> int(4) }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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