The keys method is used to retrieve all of keys stored inside the MessageBag instance. The following code example demonstrate the usage of the keys method:

 1<?php
 2 
 3use Illuminate\Support\MessageBag;
 4 
 5// Create a new MessageBag instance.
 6$messageBag = new MessageBag;
 7 
 8// Add items to the MessageBag
 9$messageBag->add('first',  'First Message');
10$messageBag->add('second', 'Second Message');
11$messageBag->add('third',  'Third Message');
12$messageBag->add('fourth', 'Fourth Message');
13 
14// Get the MessageBag keys.
15$keys = $messageBag->keys();

After the above code has executed, the $keys variable will be an array that contains a value similar to the following output:

1array (size=4)
2  0 => string 'first'  (length=5)
3  1 => string 'second' (length=6)
4  2 => string 'third'  (length=5)
5  3 => string 'fourth' (length=6)

It can be seen that the results contain only the keys that were added to the MessageBag instance.

#Continue Reading

This article is the start of a mini-series about Laravel's ErrorMessageBag component. Click through the rest of the articles to continue reading:

• An Introduction to Laravel Message Bags
• Laravel MessageBag Public API: add
• Laravel MessageBag Public API: all
• Laravel MessageBag Public API: any
• Laravel MessageBag Public API: count
• Laravel MessageBag Public API: first
• Laravel MessageBag Public API: get
• Laravel MessageBag Public API: getFormat
• Laravel MessageBag Public API: getMessageBag
• Laravel MessageBag Public API: getMessages
• Laravel MessageBag Public API: has
• Laravel MessageBag Public API: isEmpty
• Laravel MessageBag Public API: jsonSerialize
• Laravel MessageBag Public API: keys
• Laravel MessageBag Public API: merge
• Laravel MessageBag Public API: setFormat
• Laravel MessageBag Public API: toArray
• Laravel MessageBag Public API: toJson
• Laravel MessageBag Public API: __toString

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