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POPHP not finding function declared in required file
 

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    <p>Recently downloaded some code for a minor open-source project related to a small webgame I play. Trying to access it fails and spits out an error message of:</p> <blockquote> <p>PHP Fatal error: Call to undefined function v() in /Applications/MAMP/htdocs/infocenter/modules/security_mod.php on line 7</p> </blockquote> <p>After searching, I found that the function v() is defined in a file called "system.php" which is required by a file which is required by a file which is required by the "security_mod.php" file that the error occurs in. No errors occur with any of the require calls (and they're all 'require_once', not an 'include').</p> <p>This is the whole of the system.php file:</p> <pre><code>&lt;?php function v($a, $i) { return isset($a[$i]) ? $a[$i] : null; } ?&gt; </code></pre> <p>This is the function in 'security_mod.php' that throws the error (also including the require calls):</p> <pre><code>&lt;?php require_once("settings_mod.php"); require_once("account_mod.php");//this file requires base_mod.php, which requires system.php class SecurityMod { public static function checkLogin() { $name = v($_REQUEST, "acc");//this is the line that causes the error $password = v($_REQUEST, "pwd"); if (!isset($name) || !isset($password)) { return null; } $acc = AccountMod::getAccount($name); if (SettingsMod::USE_ENCRYPTED_PASSWORDS) { if (is_null($acc) || $acc-&gt;getPassword() != md5($password)) { return null; } else return $acc; } else { if (is_null($acc) || $acc-&gt;getPassword() != $password) { return null; } else return $acc; } } ?&gt; </code></pre> <p>I did a little testing, and found out that I can access variables and functions in some of the other required files. All of those are in classes, though, unlike v(). Would that be the reason?</p> <p>EDIT to clarify how 'system.php' is required: 'security_mod.php' has these two <code>require_once</code> calls at the beginning of the file:</p> <pre><code>require_once("settings_mod.php"); require_once("account_mod.php"); </code></pre> <p>'settings_mod.php' is a file containing constants used through the program, and includes no files. 'account_mod.php' has these two <code>require_once</code> calls:</p> <pre><code>require_once("base_mod.php"); require_once("account.php"); </code></pre> <p>'account.php' has a pair of <code>include_once</code> calls that include inconsequential and unrelated files. 'base_mod.php' is the file with the ultimate requirement for 'system.php':</p> <pre><code>require_once("system.php"); require_once("settings_mod.php"); </code></pre>
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    1. COCan you show how `system.php` is required exactly?
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