(PHP 8)
get_debug_type — Gets the type name of a variable in a way that is suitable for debugging
Returns the resolved name of the PHP variable value.
This function will resolve objects to their class name, resources to their
resource type name, and scalar values to their common name as would be used in type
declarations.
This function differs from gettype() in that it returns type names that are more consistent with actual usage, rather than those present for historical reasons.
valueThe variable being type checked.
Possible values for the returned string are:
| Type + State | Return Value | Notes |
|---|---|---|
| null |
"null"
|
- |
| Booleans (true or false) |
"bool"
|
- |
| Integers |
"int"
|
- |
| Floats |
"float"
|
- |
| Strings |
"string"
|
- |
| Arrays |
"array"
|
- |
| Resources |
"resource (resourcename)"
|
- |
| Resources (Closed) |
"resource (closed)"
|
Example: A file stream after being closed with fclose. |
| Objects from Named Classes |
The full name of the class including its namespace e.g. Foo\Bar
|
- |
| Objects from Anonymous Classes |
"class@anonymous"
|
Anonymous classes are those created through the $x = new class { ... } syntax |
示例 #1 get_debug_type() example
<?php
echo get_debug_type(null) . PHP_EOL;
echo get_debug_type(true) . PHP_EOL;
echo get_debug_type(1) . PHP_EOL;
echo get_debug_type(0.1) . PHP_EOL;
echo get_debug_type("foo") . PHP_EOL;
echo get_debug_type([]) . PHP_EOL;
$fp = fopen(__FILE__, 'rb');
echo get_debug_type($fp) . PHP_EOL;
fclose($fp);
echo get_debug_type($fp) . PHP_EOL;
echo get_debug_type(new stdClass) . PHP_EOL;
echo get_debug_type(new class {}) . PHP_EOL;
?>以上示例的输出类似于：
null bool int float string array resource (stream) resource (closed) stdClass class@anonymous
Also, the function returns the correct type of Closure, as opposed to gettype()
<?php
echo get_debug_type(function () {}) . PHP_EOL;
echo get_debug_type(fn () => '') . PHP_EOL . PHP_EOL;
echo gettype(function () {}) . PHP_EOL;
echo gettype(fn () => '');
?>
Output:
Closure
Closure
object
object