Sharing of specific usage skills of PHP function ob_star()_PHP tutorial

Today we will introduce to you about In PHP programming, we often encounter some functions that directly generate output, such as passthru(), readfile(), var_dump(), etc. But sometimes we want to import the output of these functions into a file, or process it first and then output it, or process the output of these functions as a string.

In this case we need to use the PHP function ob_star( ).

There are mainly several functions that handle output buffering:

PHP function ob_star() starts output buffering. At this time, PHP stops outputting, and all subsequent outputs are redirected to In an internal buffer.

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

ob_get_length() Returns the contents of the internal buffer Length.

ob_end_flush() ends the output buffer and outputs the contents of the buffer. After this, 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 content of a variable, which is very useful during debugging.
But if the content of the variable contains HTML such as < , > The special characters are invisible when output to the web page. What should I do?
Using the PHP function ob_star() can easily solve this problem.

<ol class="dp-xml">
<li class="alt"><span><span>ob_start();  </span></span></li>
<li><span>var_dump($var);  </span></li>
<li class="alt">
<span>$</span><span class="attribute">out</span><span> = </span><span class="attribute-value">ob_get_contents</span><span>();  </span>
</li>
<li><span>ob_end_clean(); </span></li>
</ol>

This The output of var_dump() is already stored in $out. You can output now:

<ol class="dp-xml"><li class="alt"><span><span>echo '</span><span class="tag"><</span><span> </span><span class="tag-name">pre</span><span class="tag">></span><span>' . htmlspec<br>ialchars($out) . '</span><span class="tag"><</span><span> /pre</span><span class="tag">></span><span>' ; </span></span></li></ol>

or wait until the future, or send this string to the template (Template) and then output.

The above is a comparison of the functional advantages of the PHP function ob_star().

http://www.bkjia.com/PHPjc/446220.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446220.htmlTechArticleToday we will introduce to you about in PHP programming, we often encounter some functions that directly generate output. Such as passthru(), readfile(), var_dump(), etc. But sometimes we want to use these...