php function Ob_star () the specific use of tips to share _php tutorials

We are going to introduce to you todayIn PHP programming, we often encounter some functions that produce output directly, such as PassThru (), ReadFile (), Var_dump (), and so on. But sometimes we want to import the output of these functions into a file, or go through processing and re-output, Or the output of these functions is treated as a string.

At this point we are going to use PHP function Ob_star ().

There are several main functions that handle output buffering:

php function Ob_star () starts the output buffer, when PHP stops the output, after which the output is transferred to an internal buffer.

Ob_get_contents () This function returns the contents of the internal buffer. This is tantamount to turning these outputs into strings.

Ob_get_ Length () returns the size of the internal buffer.

Ob_end_flush () ends the output buffer and outputs the contents of the buffer. After that, the output is normal output.

Ob_end_clean () ends the output buffer and discards the contents of the buffer.

For example, the Var_dump () function outputs the structure and contents of a variable, which is useful when debugging.
But if the contents of the variable have <, > and other special characters of HTML, the output to the Web page is not visible. What do we do?
It is easy to solve this problem with PHP function Ob_star ().

 
  
  

  
   
   
Ob_start (); 
  
   
   
Var_dump ($var); 
  
   
   
$  out  ob_get_contents(); 
  
   
   

 
  
  

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

 
  
  

  
   
   
Echo ' <  pre>'. Htmlspec
Ialchars ($out). '<  /pre>
 
  
  

Or wait until the future, or send the string to the template and then output.

This is the functional advantage Comparison of PHP function Ob_star ().

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