php uses ob_start of to realize the method of saving pictures into variables

In this paper, the method of php using ob_start () to store pictures into variables is described as an example. Share it for your reference. The specific implementation method is as follows:

With php GD library after processing the picture, can only use imagejpeg () picture output, or write a file. Most of the time, you don't need to do this. For example, if you want to store a picture in the database, you need to save the picture write variable. Enable the cache with ob_start () and get the cache with ob_get_contents (), you can write the picture into the variable

<?php

$imgPath =" Picture address " ;

// Get picture 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 );

...

// Turn on the cache 

ob_start();

// Generate a 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 pictures into variables 

$imageCode = ob_get_contents();

ob_end_clean();

Individuals do not build meaning to save the picture in variables, which will waste resources. Here is also Test 1.

I hope this article is helpful to everyone's PHP programming.