PHP ob_start ()-PHP source code

Ec (2); in PHP programming, we often encounter some functions that directly generate output, such as passthru (), readfile (), var_dump (), etc. 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 OutputBuffer function. there are several main functions for processing the output buffer: ob_start (script ec (2); script

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 Output Buffer function.

There are several main functions for processing the output buffer:

Ob_start () starts to output the buffer, and PHP stops the output. After that, the output is forwarded 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 output buffer function 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''

'' . htmlspecialchars($out) . ''

'';

Or wait till the future, or send this string to the Template before outputting it.

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