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Showing results for tags 'global variable'.
Found 3 results
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I wrote a long explaination, but then the page was refreshed an I lost it... essentially I can't get variables to work between functions, resorted to globals, I can get away with it, but I can't even get that to worl... code: <?php global $checkvar; //get the 'checkvar' this is an array of strings $checkvar = $_GET['checkvar']; checkvariable(); function checkvariable() { var_dump($checkvar); } ?> the dump of $checkvar comes up NULL in the function, but fine right after its been called.
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I took the following code from http://www.w3schools...p_variables.asp <?php $a = 5; $b = 10; function myTest() { global $a, $b; $b = $a + $b; } myTest(); echo $b; (this outputs 15) ?> The echo of $b comes after the closing of the function. The output is 15. If you add another echo inside the function like below: <?php $a = 5; $b = 10; function myTest() { global $a, $b; $b = $a + $b; } echo $b; (this one outputs 10) myTest(); echo $b; (this one outputs 15) ?> then the output for that echo is 10. I understand that the function is calling the global variables, but shouldnt the echo inside the function equal 15 and the one outside equal 10?, since it only refers to the global "$b" and is outside the function? Or does the global call inside the function completely change $b for the rest of the script? Thanks guys (and gals)
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Thank you for taking the time to help me. I am trying to generate a string of sixteen characters that can look like 0000000000000000 to 9999999999999999 and set it as the global variable of $User_ID Here is the part of the code I am having trouble with: function genRandomString() { global $User_ID; $length = 16; $characters = "0123456789"; for ($p = 0; $p < $length; $p++) { $User_ID .= $characters[mt_rand(0, strlen($characters))]; } } Here is my whole code: <?php $con = mysql_connect("localhost","******","******"); if (!$con){ die('Could not connect: . mysql_error()'); } mysql_select_db("******", $con); echo "Connected to: " . $con; $eMail="$_POST[eMail]";$User_ID=""; echo "<br>My eMail: " . $eMail; $eMailResult = mysql_query("SELECT * FROM eMail WHERE eMail='$eMail'"); if (mysql_num_rows($eMailResult) == 0){ echo "<br>eMail is Unique"; } else { echo "eMail is NOT Unique<br>";} function genRandomString() { global $User_ID; $length = 16; $characters = "0123456789"; for ($p = 0; $p < $length; $p++) { $User_ID .= $characters[mt_rand(0, strlen($characters))]; } } echo "<br>User ID: " . $User_ID; mysql_close($con); ?>
