resize gambar

<?php

$file_gbr='1.jpg'; //contoh memakai jpg silakan update dengan keperluan
$file_hasil='1_res.jpg';
$width=300;
$height=500;
$center=TRUE;

ResizeImage($file_gbr, $file_hasil, $width, $height, $center);

echo "<img src='".$file_hasil."' />";

function resizeImage($img0, $img1, $width1, $height1, $center=FALSE){
    list($width0, $height0) = getimagesize($img0);
    //sumber https://stackoverflow.com/questions/14649645/resize-image-in-php
    //$r = $width / $height;
    //perbandingan antara panjang lebar gambar sumber
    $resize0 = $width0 / $height0;

    //perbandingan antara panjang lebar gambar tujuan
    $resize1 = $width1 / $height1;
    logTxt("r: $resize0 | $resize1 ");
    if( $resize1 > $resize0){
        logTxt('-r1-');
        $newWidth = $height1 * $resize0 * $resize1;
        $newHeight= $height1;
    }else{
        logTxt('-r0-');
        $newHeight = $width1 / $resize0 * $resize1;
        $newWidth= $width1;
    }

    logTxt("h,w: ($newHeight|$newWidth)");
    //sesuaikan dengan tipe gbr
    $imgSrc = imagecreatefromjpeg($img0);

    if($center){
        //posisi x,y
        $x1= ceil( ($width1 - $newWidth) /2);
        $y1= ceil( ($height1  - $newHeight) /2);
        logTxt("w,h : $width1,$height1 | $newWidth,$newHeight");
        logTxt("x,y : $x1,$y1");
        //ukuran disesuaikan dgn request
        $imgTarget=imagecreatetruecolor($width1, $height1);
        imagecopyresized($imgTarget, $imgSrc, $x1, $y1, 0, 0, $newWidth, $newHeight, $width0, $height0);

    }else{
        //ukuran sesuai dengan ukuran baru
        $imgTarget=imagecreatetruecolor($newWidth, $newHeight);
        logTxt("not center :  $newWidth, $newHeight, $width0, $height0");
        imagecopyresized($imgTarget, $imgSrc, 0, 0, 0, 0, ceil($newWidth), ceil($newHeight), $width0, $height0);

    }
    //save gambar
    imagejpeg($imgTarget, $img1);
}

function logTxt($str){
    $file='1.log';
    error_log($str."\n",3,$file);
}