function pHashWithDCT($file)
{
$hash = array();
$image = imagecreatefromstring(file_get_contents($file));
$image = resizetosquare($image, 8);
$image = grayscale($image);
$dct = optimizedImgDTC($image);
foreach ($dct as $key => $val) {
$avg = array_average($val);
foreach ($dct[$key] as $bit => $bit_val) {
if ($bit_val < $avg) {
array_push($hash, 0);
} else {
array_push($hash, 1);
}
}
}
return $hash;
}
<!--
Author: Juan Diego Pérez @pekechis
E-mail: contact@jdperez.es
Description: Creating a Function that calculates the average value of an indexed array
of integer. The function is defined in library.php
Date: November 2015
Reference: http://php.net/manual/functions.user-defined.php
http://php.net/manual/function.include.php
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CALCULATE THE AVERAGE OF AN ARRAY OF INTEGERS</title>
</head>
<body>
<?php
//Including the file where array_average is defined
include_once "library.php";
//Declaring the array with the data
$data = array(23, 23, 45, 56, 78, 99, 100, 200);
//Printing the average in the screen
echo "The average is:" . array_average($data);
?>
</body>
</html>
/**
* 计算方差
*
* @param array $a 数字的数组
* @return double
*/
function variation_and_standard_deviation(array $a)
{
if (empty($a)) {
return FALSE;
}
$average = array_average($a);
//计算平均值
$i = 0.0;
foreach ($a as $key => $value) {
$i += pow($value + 0 - $average, 2);
}
return $i / count($a);
}