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copied!<p>in the function ,</p> <p>he dont know what is <code>$connection</code> variable,</p> <p>one option to send the connection as argument to the function</p> <pre><code>function get_all_subjects($connection) { .......... </code></pre> <p>}</p> <p>and call to function</p> <pre><code>$subject_set = get_all_subjects($connection); </code></pre> <p>look on variables scope <a href="http://php.net/manual/en/language.variables.scope.php" rel="nofollow">manual</a></p> <blockquote> <p>Here the <code>$a</code> variable will be available within the included b.inc script. However, within user-defined functions a local function scope is introduced. Any variable used inside a function is by default limited to the local function scope. For example:</p> </blockquote> <pre><code><?php $a = 1; /* global scope */ function test() { echo $a; /* reference to local scope variable */ } test(); ?> </code></pre> <blockquote> <p>This script will not produce any output because the echo statement refers to a local version of the $a variable, and it has not been assigned a value within this scope. You may notice that this is a little bit different from the C language in that global variables in C are automatically available to functions unless specifically overridden by a local definition. This can cause some problems in that people may inadvertently change a global variable. In PHP global variables must be declared global inside a function if they are going to be used in that function.</p> </blockquote>

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