Example of proportional scaling of database images with php and js_javascript skills

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PHP proportional scaling of database images

//Constantial scaling of pictures

//Because PHP can only operate on resources, you need to copy the pictures that need to be scaled and create them as new resources
$src =imagecreatefromjpeg($img_address);

//Get the width and height of the source image
$size_src=getimagesize($img_address);
$w=$size_src['0'];
$h=$size_src['1'];

//Specify the maximum width (maybe height) of scaling
$max=300;

//According to The maximum value is 300, calculate the length of the other side, and get the scaled image width and height
if($w > $h){
$w=$max;
$h=$h *($max/$size_src['0']);
}else{
$h=$max;
$w=$w*($max/$size_src['1']) ;
}


//Declare a true color image resource of $w width and $h height
$image=imagecreatetruecolor($w, $h);


//Key function, parameters (target resource, source, starting coordinates x,y of the target resource, starting coordinates x,y of the source resource, width and height w,h of the target resource, width and height w of the source resource, h)
imagecopyresampled($image, $src, 0, 0, 0, 0, $w, $h, $size_src['0'], $size_src['1']);

//Tell the browser to parse
header('content-type:image/png');
imagepng($image);

//Destroy resources
imagedestroy($ image);
}
}
$obj=new ImgSF();
$obj->make_img("./img/IMG_20140424_200722.jpg");