PHP function ob_star () tips _ PHP Tutorial

Tips for using PHP function ob_star. Today we will introduce some functions that directly generate output in PHP programming, such as passthru (), readfile (), var_dump. but sometimes we want to introduce this to you today.In PHP programming, we often encounter some functions that directly generate output, such as passthru (), readfile (), and var_dump. however, sometimes we want to import the output of these functions to a file, or process the output of these functions as strings.

Now we need to use the PHP function ob_star.

There are several main functions for processing the output buffer:

The PHP function ob_star () starts to output the buffer. at this time, PHP stops the output and the output will be transferred to an internal buffer.

The ob_get_contents () function returns the content of the internal buffer. this is equivalent to converting these outputs into strings.

Ob_get _ length () returns the length of the internal buffer.

Ob_end_flush () ends the output buffer and outputs the content in the buffer. after that, the output is normal.

Ob_end_clean () ends the output buffer and discards the content in the buffer.

For example, the var_dump () function outputs the structure and content of a variable, which is useful during debugging.
However, if the variable content contains special HTML characters such as <,>, the output will be invisible to the webpage. what should I do?
The PHP function ob_star () can easily solve this problem.

 
 

  
  
ob_start(); 
  
  
var_dump($var); 
  
  
$out = ob_get_contents(); 
  
  
ob_end_clean(); 
 
 

At this time, the output of var_dump () already exists in $ out. you can output it now:

 
 

  
  
echo '< pre>' . htmlspec
ialchars($out) . '< /pre>' ; 
 
 

Or wait for the future, or send this string to the Template and then output it.

The above is the functional advantages of PHP function ob_star.

Pipeline in PHP programming, we often encounter some functions that directly generate output, such as passthru (), readfile (), var_dump (). but sometimes we want to put these...