How do I reduce image size in php?

I am using a PHP file as an API to upload photos to my app but the images are uploaded in a big size I need to reduce the image size but keep a good quality

I am using this code to upload photos

$imagearray =  json_decode($_POST['img']);

 foreach($imagearray as $value){

    $data = explode(',', $value);

    $imagedata = base64_decode($data[1]);

    $nam =  genRandomString().'.jpeg';

    $target_path='../uploads/'.$nam;

    file_put_contents($target_path,$imagedata);

    if($imgsname=="")

    {

    $imgsname=$nam;

    $imgname=$nam;

    }

    else

    {

    $imgsname=$imgsname.','.$nam;

    }
}

Answer

First of all hello welcome. Please search before asking questions first.

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If you are looking to reduce the size using coding itself, you can follow this code in php.

<?php

function compress($source, $destination, $quality) {

    $info = getimagesize($source);

    if ($info['mime'] == 'image/jpeg') 
        $image = imagecreatefromjpeg($source);

    elseif ($info['mime'] == 'image/gif') 
        $image = imagecreatefromgif($source);

    elseif ($info['mime'] == 'image/png') 
        $image = imagecreatefrompng($source);

    imagejpeg($image, $destination, $quality);

    return $destination;
}

$source_img = 'source.jpg';
$destination_img = 'destination .jpg';

$d = compress($source_img, $destination_img, 90);
?>

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$d = compress($source_img, $destination_img, 90);

This is just a php function that passes the source image ( i.e., $source_img ), destination image ( $destination_img ) and quality for the image that will take to compress ( i.e., 90 ).

$info = getimagesize($source);

The getimagesize() function is used to find the size of any given image file and return the dimensions along with the file type.

Referrer : Which is the best PHP method to reduce the image size without losing quality