A deep dive into the methods available for PHP inspection functions_PHP Tutorial

We are using

PHP to check that the function is available 1. Get all available modules - get_loaded_extensions
This function returns all loaded (available) modules.

Usage:

print_r(get_loaded_extensions());

PHP check function available 2. Get the available functions of the specified module - get_extension_funcs
This function returns all the functions of the specified module Available functions. The incoming parameters (module name) must be lowercase

Usage:

print_r(get_extension_funcs("gd"));

PHP check function available 3. Get all the functions that have been Defined functions - get_defined_functions
This function returns all defined functions, including built-in functions and user-defined functions.

Usage:

<ol class="dp-xml">
<li class="alt"><span><span>function myrow($id, $data){   </span></span></li>
<li>
<span>return "</span><span class="tag"><</span><span class="tag-name">tr</span><span class="tag">></span><span class="tag"><</span><span class="tag-name">th</span><span class="tag">></span><span>$id</span><span class="tag"></</span><span class="tag-name">th</span><span class="tag">></span><span class="tag"><</span><span class="tag-name">td</span><span class="tag">></span><span>$data</span><span class="tag"></</span><span class="tag-name">td</span><span class="tag">></span><span class="tag"></</span><span class="tag-name">tr</span><span class="tag">></span><span>n";   </span>
</li>
<li class="alt"><span>}   </span></li>
<li>
<span>$</span><span class="attribute">arr</span><span> = </span><span class="attribute-value">get_defined_functions</span><span>();   </span>
</li>
<li class="alt"><span>print_r($arr);   </span></li>
</ol>

Output:

<ol class="dp-xml">
<li class="alt"><span><span>Array   </span></span></li>
<li><span>(   </span></li>
<li class="alt">
<span>[internal] =</span><span class="tag">></span><span> Array   </span>
</li>
<li><span>(   </span></li>
<li class="alt">
<span>[0] =</span><span class="tag">></span><span> zend_version   </span>
</li>
<li>
<span>[1] =</span><span class="tag">></span><span> func_num_args   </span>
</li>
<li class="alt">
<span>[2] =</span><span class="tag">></span><span> func_get_arg   </span>
</li>
<li>
<span>[3] =</span><span class="tag">></span><span> func_get_args   </span>
</li>
<li class="alt">
<span>[4] =</span><span class="tag">></span><span> strlen   </span>
</li>
<li>
<span>[5] =</span><span class="tag">></span><span> strcmp   </span>
</li>
<li class="alt">
<span>[6] =</span><span class="tag">></span><span> strncmp   </span>
</li>
<li><span>...   </span></li>
<li class="alt">
<span>[750] =</span><span class="tag">></span><span> bcscale   </span>
</li>
<li>
<span>[751] =</span><span class="tag">></span><span> bccomp   </span>
</li>
<li class="alt"><span>)   </span></li>
<li>
<span>[user] =</span><span class="tag">></span><span> Array   </span>
</li>
<li class="alt"><span>(   </span></li>
<li>
<span>[0] =</span><span class="tag">></span><span> myrow   </span>
</li>
<li class="alt"><span>)   </span></li>
<li><span>)  </span></li>
</ol>

where $arr["internal"] is the built-in Function, $arr["user"] is a user-defined function.

PHP check function available 4. Check whether the specified function exists - function_exists

This function returns whether the specified function has been defined.

Usage:

<ol class="dp-xml">
<li class="alt"><span><span>if (function_exists('imap_open')) {   </span></span></li>
<li>
<span>echo "IMAP functions are available.</span><span class="tag"><</span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>n";   </span>
</li>
<li class="alt"><span>} else {   </span></li>
<li>
<span>echo "IMAP functions are not available.</span><span class="tag"><</span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>n";  </span>
</li>
</ol>

http://www.bkjia.com/PHPjc/446021.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446021.htmlTechArticleWe are using PHP to check that the function is available 1. Get all available modules - get_loaded_extensions This function returns all loaded ( available) modules. Usage: print_r(get_loade...