In 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 the output buffer function. There are several functions that handle output buffering: Ob_start () 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 the output buffering function. Ob_start (); Var_dump ($var); $out = Ob_get_contents (); Ob_end_clean (); At this time the output of var_dump () already exists $out. You can output it now: Echo
. Htmlspecialchars ($out).
; Or wait until the future, or send the string to the template and then output.
http://www.bkjia.com/PHPjc/531649.html www.bkjia.com true http://www.bkjia.com/PHPjc/531649.html techarticle in 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 ...
