PHP uses ob_start() to implement the method of storing images into variables, _PHP tutorial

php uses ob_start() to implement the method of storing images into variables,

The example in this article describes how PHP uses ob_start() to store images into variables. Share it with everyone for your reference. The specific implementation method is as follows:

After processing the image with PHP's GD library, you can only output the image using imagejpeg() or write it to a file. Many times this is not necessary. For example, if you want to store a picture in the database, you need to write the picture into a variable to save it. Use ob_start() to enable the cache and ob_get_contents() to get the cache and then write the picture into the variable

Copy code The code is as follows:

$imgPath ="image address" ;
//Get image information $imgPath can be a remote address
list( $srcWidth, $srcHeight, $type ) = getimagesize( $imgPath );
...
switch( $type ) {
case 1: $imgCreate = 'ImageCreateFromGIF'; break;
case 2: $imgCreate = 'ImageCreateFromJPEG'; break;
case 3: $imgCreate = 'ImageCreateFromPNG'; break;
default: return false;
}
$orig = $imgCreate( $imgPath );
...
//Enable caching
ob_start();
//Generate picture
switch ($type)
{
case 1: imagegif($orig); break;
case 2: imagejpeg($orig); break; // best quality
case 3: imagepng($orig); break; // no compression
default: echo ''; break;
}
//Save the image into a variable
$imageCode = ob_get_contents();
ob_end_clean();

Personally, I don’t recommend saving images in variables, as this would be a waste of resources. I’m just testing it here.

I hope this article will be helpful to everyone’s PHP programming design.

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