PHP generates pie chart instances based on data

The function to be implemented here is the population distribution ratio chart, which consists of a circle of sectors, each of which is not the same color.

<?php$array = Array ("Beijing" =>1925, "Shanghai" =>2016, "Guangzhou" =>1256, "Shenzhen" =>980); $arr _key = Array_keys ($array); $ color = Array (), $im = Imagecreatetruecolor (300,300), for ($i =1; $i <=count ($array); $i + +) {$color [] = Imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255));} Creates a pie chart, consisting of multiple sector $a1=rand (0,360), $sum = Array_sum ($array), for ($j =0; $j <count ($arr _key); $j + +) {$a 2 = $a 1 + $arr _key[$j ]/$sum *360; Imagefilledarc ($im, 150,150,180,80, $a 1, $a 2, $color [$j],img_arc_pie); $a 1 = $a 2;} Output image Header ("Content-type:image/png"); Imagepng ($im);//Close Imagedestroy ($im); >

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