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    <p>Your function <code>validateText()</code> is a <code>static</code> function; because of this, it doesn't belong to a single "instance" of the class <code>Validation</code> but instead to <em>all</em> of them and, therefore, is not applicable to the <code>$this</code> keyword.</p> <p>Your choices here are to either drop <code>static</code> from the function declaration or to make <code>$errorMsg</code> static itself (which, based on it's definition may be a good way to go):</p> <pre><code>public static $errorMsg = array( 1000 =&gt; 'Some Error', 1001 =&gt; 'Some other error'); static function validateText($value) { if (!empty($value)) { if (ctype_alpha($value)) { return false; } else { return Validation::$errorMsg[1001]; //getting error here } } else { return Validation::$errorMsg[1001];//getting error here } } </code></pre> <p><strong>Add-on</strong> (const versus static)<br> Based on recommended comments, I am also adding in the "appropriate" way to handle your exact situation. The above will fix your error, however, it is not the best way to approach "error messages" as class-properties. Instead of using <code>static</code>, you can setup a list of constant class members using the <a href="http://php.net/manual/en/language.oop5.constants.php" rel="nofollow"><code>const</code></a> keyword (which won't work with arrays, so you'll be creating several variables here instead):</p> <pre><code>class Validation { const SOME_ERROR = 'Some Error'; const SOME_OTHER_ERROR = 'Some other error'; static function validateText($value) { // process value return Validation::SOME_ERROR; } } </code></pre> <p>You can also access these constants from outside of the <code>Validation</code> class via: <code>Validation::SOME_ERROR</code> and, if you have PHP 5.3+, you can use:</p> <pre><code>$v = new Validation(); echo $v::SOME_ERROR; </code></pre>
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    1. POHow access class propery which is array? PHP
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    1. COHow is making property static is preferable solution in PHP? Not to speak about hardcoded error messages in class.
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    2. CO@Leri I'm slightly confused by your question; "how is making a property static a preferable solution" - this is a solution that's used in countless languages, PHP being one of them. This exact example, an array of error messages, is a good example of when/how to use a static variable in a class as it won't change between instances (not to mention the method itself is static). The alternative, which won't work with arrays, is to define a `const` (or, in this case, several `const` variables). However, to address the OP's actual problem, I stuck with `static`.
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    3. COThe main idea was that while this is solution and correct one it's not better than having instance variables. Because like that you can have multiple validators with different error messages. If you'd want to share data between instances, you could pass the same array to those instances. Also with static you create hidden dependencies all over your script.
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