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    <p>By default, when you are inside a function, you do not have access to the outer variables.</p> <p><br> If you want your function to have access to an outer variable, you have to declare it as <code>global</code>, inside the function :</p> <pre><code>function someFuntion(){ global $myArr; $myVal = //some processing here to determine value of $myVal $myArr[] = $myVal; } </code></pre> <p>For more informations, see <a href="http://www.php.net/manual/en/language.variables.scope.php" rel="noreferrer"><strong>Variable scope</strong></a>.</p> <p>But note that <strong>using global variables is not a good practice</strong> : with this, your function is not independant anymore.</p> <p><br> A better idea would be to make your function <strong>return the result</strong> :</p> <pre><code>function someFuntion(){ $myArr = array(); // At first, you have an empty array $myVal = //some processing here to determine value of $myVal $myArr[] = $myVal; // Put that $myVal into the array return $myArr; } </code></pre> <p>And call the function like this :</p> <pre><code>$result = someFunction(); </code></pre> <p><br> Your function could also take parameters, and even <strong>work on a parameter passed by reference</strong> :</p> <pre><code>function someFuntion(array &amp; $myArr){ $myVal = //some processing here to determine value of $myVal $myArr[] = $myVal; // Put that $myVal into the array } </code></pre> <p>Then, call the function like this :</p> <pre><code>$myArr = array( ... ); someFunction($myArr); // The function will receive $myArr, and modify it </code></pre> <p>With this :</p> <ul> <li>Your function received the external array as a parameter</li> <li>And can modify it, as it's passed by reference.</li> <li>And it's better practice than using a global variable : your function is a unit, independant of any external code.</li> </ul> <p><br> For more informations about that, you should read the <a href="http://www.php.net/manual/en/language.functions.php" rel="noreferrer"><strong>Functions</strong></a> section of the PHP manual, and,, especially, the following sub-sections :</p> <ul> <li><a href="http://www.php.net/manual/en/functions.arguments.php" rel="noreferrer">Functions arguments</a></li> <li><a href="http://www.php.net/manual/en/functions.returning-values.php" rel="noreferrer">Returning values</a></li> </ul>
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    1. USPascal MARTIN
    1. USPascal MARTIN
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    1. COWhat's with all the down-votes?
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      1. USPatrikAkerstrand
    2. CO@Machine : quite a good question ^^ *(I have, since, edited my answer a couple of time to add more informations ; maybe it was downvoted because not complete enough, at first... It probably has something to do with global, which people don't like...)*
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    3. CO@Machine Mr Anti-Global @Coronatus has decided that perfectly viable answers are wrong. And his 1,662 rep makes him right...
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      1. USTyler Carter
 

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