lafif-a
5/15/2015 - 4:30 AM

## [php][array] get random most priority value

[php][array] get random most priority value

``````<?php
/**
* getMostPriority()
* Utility function for getting random values with weighting.
* Pass in an associative array, such as array('A'=>5, 'B'=>45, 'C'=>50)
* An array like this means that "A" has a 5% chance of being selected, "B" 45%, and "C" 50%.
* The return value is the array key, A, B, or C in this case.  Note that the values assigned
* do not have to be percentages.  The values are simply relative to each other.  If one value
* weight was 2, and the other weight of 1, the value with the weight of 2 has about a 66%
* chance of being selected.  Also note that weights should be integers.
*
* @param array \$arr
*/
function getMostPriority(array \$arr) {
\$rand = mt_rand(1, (int) array_sum(\$arr));

foreach (\$arr as \$key => \$value) {
\$rand -= \$value;
if (\$rand <= 0) {
return \$key;
}
}
}

\$arr = array(
'A' => 	'8',
'B' =>	'9'
);

echo 'from getMostPriority(); '.getMostPriority(\$arr, 'priority');
echo "<br>";

// for multidimentional
function getMostPriorityMulti(array \$arrMulti, \$priority) {
\$sum = 0;
foreach(\$arrMulti as \$num => \$values) {
\$sum += \$values[ \$priority ];
}

\$rand = mt_rand(1, (int) \$sum);

foreach (\$arrMulti as \$key => \$value) {
\$rand -= \$value['priority'];
if (\$rand <= 0) {
return \$key;
}
}
}

\$arrMulti = array(
'A' => 	array(
'priority' 	=> '2',