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PHP provides many useful standard functions. The following table lists several commonly used ones:
| Function | Description |
|---|---|
| boolval | Get the boolean value of a variable |
| debug_zval_dump | View a variable's reference count and type information in the Zend engine |
| doubleval | Alias of floatval |
| empty | Check whether a variable is empty |
| floatval | Get the floating-point value of the variable |
| get_defined_vars | Return an array composed of all defined variables |
| get_resource_type | Return the resource (resource) type |
| gettype | Get the type of the variable |
| import_request_variables | Import GET/POST/Cookie variables into the global scope |
| intval | Get the integer value of the variable |
| is_array | Check whether the variable is an array |
| is_bool | Check whether the variable is a boolean type |
| is_callable | Check whether the parameter is a valid callable structure |
| is_double | Alias of is_float |
| is_float | Check whether the variable is a floating-point type |
| is_int | Check whether the variable is an integer |
| is_integer | Alias of is_int |
| is_iterable | Check whether the content of the variable is an iterable value |
| is_long | Alias of is_int |
| is_null | Check whether the variable is NULL |
| is_numeric | Check whether the variable is a number or a numeric string |
| is_object | Check whether the variable is an object |
| is_real | Alias of is_float |
| is_resource | Check whether the variable is a resource type |
| is_scalar | Check whether the variable is a scalar |
| is_string | Check whether the variable is a string |
| isset | Check whether the variable is set and not NULL |
| print_r | Print the variable, output information that is easy to read. |
| serialize | Serialize the object |
| settype | Set the type of the variable |
| strval | Get the string value of the variable |
| unserialize | Create PHP's value from the stored representation |
| unset | Free the given variable |
| var_dump | Print the relevant information of the variable |
| var_export | Output or return a variable in string format |
| Function | Description |
|---|---|
| password_get_info | Return information related to the specified hash (hash) |
| password_hash | Create a hash (hash) of the password |
| password_needs_rehash | Check whether the hash value matches the specified option |
| password_verify | Verify whether the password matches the hash value |