| 1 | <?php  | 
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| 10 | trait DNSisAlreadyConfigured  | 
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| 11 | { | 
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| 12 | /**  | 
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| 13 | * Check if DNS is already configured.  | 
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| 14 | *  | 
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| 15 | * @param null $domain  | 
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| 16 | * @param null $ip  | 
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| 17 | * @return bool  | 
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| 18 | */  | 
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| 19 | protected function dnsResolutionIsOk($domain = null, $ip = null)  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * Obtain domain.  | 
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| 40 | *  | 
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| 41 | * @return mixed  | 
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| 42 | */  | 
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| 43 | protected function obtainDomain()  | 
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| 47 | |||
| 48 | /**  | 
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| 49 | * Obtain IP.  | 
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| 50 | *  | 
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| 51 | * @return mixed  | 
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| 52 | */  | 
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| 53 | protected function obtainIp()  | 
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| 57 | }  | 
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| 58 | 
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: