Create and return an array of values:
quicker than using $myarray = "value1" etc.
$array1 = array("value1",4,"value3"); $array2 = array("value1",3,"string value"); $array3 = array("value3","any value");
To create an associative array, use => to link the key to the corresponding value:
$names_array = array("Bob" => "Jones","Fred" => "Bloggs", "June" => "Smith")
To help find the differences between two or more arrays, array_diff() returns an array containing only the values from $array1 that do NOT occur in any of the other arrays.
$diff_array = array_diff($array1, $array2, $array3);
$diff_array contains only one value, 4 in $diff_array indicating that the first value $array1 = value1 was matched, the second value $array1 = 4 was different and the third value $array1 = value3 was matched.
An array containing names from an address book could contain firstnames as keys and family names as values - the $names_array above. Sorting the array using asort(), sorts on the values - the family name. To sort the array on firstnames, use ksort().
sorts the array by the value - familyname. $names_array now contains:
Fred Bloggs Bob Jones June Smith
ksort() sorts the array by the key - firstname. $names_array now contains:
Bob Jones Fred Bloggs June Smith
To reverse the order, use rsort() for simple arrays and arsort() for associative arrays. To reverse the order of a ksort() requires two operations - use ksort() as normal and then use array_reverse() to reverse the ksort. To convert keys into values and the values into keys, use array_flip().
arsort($names_array); June Smith Bob Jones Fred Bloggs ksort($names_array); $names_array = array_reverse($names_array); June Smith Fred Bloggs Bob Jones $names_array = array_flip($names_array); Smith June Bloggs Fred Jones Bob
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