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*[VarDumper from Symfony](https://symfony.com/doc/current/components/var_dumper.html)
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*[Kint - a modern and powerful PHP debugging helper](https://kint-php.github.io/kint/)
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## Debugging Variable Dumpers
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This plugin provides two different tools for dumping variables:
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* VarDumper from Symfony
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* Kint
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VarDumper provides a simple container that displays where you place it.
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Kint gathers all the data and displayed it at the bottom of the screen as a fixed position container. It also provides a call stack, which can be handy, and tracing functionality if you need it.
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### Which one should you use?
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It depends.
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1. You want to simply display the contents of a variable: Use VarDumper's functions, i.e. `vdump()`, `vd()`, `vdd()`, or `vddd()`.
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2. You want the call stack in addition to the variable: Use Kint's functions: `d()`, `dd()`, or `ddd()`.
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### Functions
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| Task | VarDumper | Kint |
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| :--- | :--- | :--- |
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| Dumps the given variable(s) |`vd( mixed $var );`|`d( mixed $var [ , mixed $var2, ...] );`|
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| Dumps the given variable(s) |`vdump( mixed $var );`|`Kint::dump( mixed $var [ , mixed $var2, ...] );`|
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| Dumps and dies |`vdd( mixed $var );`|`dd( mixed $var [ , mixed $var2, ...] );`|
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| Dumps and dies |`vddd( mixed $var );`|`ddd( mixed $var [ , mixed $var2, ...] );`|
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| Dumps and dies |`vddd( mixed $var );`|`ddd( mixed $var [ , mixed $var2, ...] );`|
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| Dumps plain text | na |`s( mixed $var [ , mixed $var2, ...] );`|
Notice the subtle differences between the three different ways of dumping the title out to the browser:
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* VarDumper's `vd()` provides a very simple highlighter around the title.
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* Kint's `d()` is shown at the bottom of the screen and contains the function, string length, title, and call stack.
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* Kint's `s()` provides a similar display as `vd()` except that it also includes what was passed into the function (shown in the dashed box), string length, value (title), and where the function was called from in your code.
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#### How about for arrays, objects, etc?
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Here's the example code for `vd()`:
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```php
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add_action( 'loop_start', function() {
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$array = [
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'ID' => get_the_ID(),
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'title' => get_the_title(),
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];
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vd( $array );
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} );
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```
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It renders as:
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Here's the example code for `d()`:
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```php
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add_action( 'loop_start', function() {
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$array = [
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'ID' => get_the_ID(),
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'title' => get_the_title(),
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];
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d( $array );
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} );
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```
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It renders as:
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Here's the example code for `s()`:
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```php
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add_action( 'loop_start', function() {
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$array = [
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'ID' => get_the_ID(),
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'title' => get_the_title(),
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];
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s( $array );
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} );
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```
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It renders as:
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## Whoops - An Awesome PHP Error Tool
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The built-in PHP error container is basic and not as helpful as it could be. On top of that, it's rather ugly. Wouldn't you agree?
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The Whoops package gives you a cool interface that is helpful, interactive, and quite nice to look at .
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Consider the error this code would produce:
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```php
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add_action( 'loop_start', function() {
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does_not_exist();
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} );
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```
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You can learn more about Whoops by visiting [http://filp.github.io/whoops/](http://filp.github.io/whoops/).
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