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PHP checks what methods are available for functions. In view of this problem, this article introduces the corresponding analysis and solutions in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

When we use PHP for actual coding, we will definitely use functions, but how can we solve the problem that this function is a good enough test? Let's take a specific look at the methods and techniques available for PHP checking functions.

The PHP check function is available 1. 0. Get all available modules-get_loaded_extensions

This function returns all loaded (available) modules.

Usage:

Print_r (get_loaded_extensions ())

The PHP check function is available for 2. 0. Get the available function of the specified module-get_extension_funcs

This function returns all the functions available for the specified module. The parameter passed in (module name) must be lowercase

Usage:

Print_r (get_extension_funcs ("gd"))

The PHP check function is available 3. 0. Get all defined functions-get_defined_functions

This function returns all defined functions, including built-in functions and user-defined functions.

Usage:

Function myrow ($id, $data) {return "$id$data\ n";} $arr = get_defined_functions (); print_r ($arr)

Output:

Array ([internal] = > zend_version [1] = > func_num_args [2] = > func_get_arg [3] = > func_get_args [4] = > strlen [5] = > strcmp [6] = > strncmp. [7505] = > bcscale [751] = > bccomp) [user] = > Array ([0] = > myrow))

Where $arr ["internal"] is a built-in function and $arr ["user"] is a user-defined function.

The PHP check function is available in 4. 0. Check whether the specified function exists-function_exists

This function returns whether the specified function has been defined.

Usage:

If (function_exists ('imap_open')) {echo "IMAP functions are available.\ n";} else {echo "IMAP functions are not available.\ n"; this is the answer to the question about what is available for PHP checking functions. I hope the above content can be of some help to everyone. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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