Passing php variables through the parameters to a javascript function, PHP, JAVASCRIPT

Question

I'm trying to pass a string variable through the parameter of a php function called alertText to a javascript function called alert, to alert a message to the screen, but it's not accepting the php variable for some reason, and nothing is being alerted to the screen. Please take a look:

testing.php

function alertText($text) {
echo "
<script>
alert($text);
</script>
";
}
alertText("Hello");
?>

Answer 1

You need to single-quote the $text variable, because JavaScript is not recognizing that variable as string.

<?php 
function alertText($text) {
 echo "<script>alert('$text');</script>";
}
alertText("Hello");

Answer 2

You could concatenate it to get a more readable code.

function alertText($text) {
 echo "<script>alert('".$text."');</script>";
}
alertText('Hello');

Answer 3

Very simple mistake, you forgot to close the double quote letting the parser know that $text is not the word $text (hey it could happen!).

We use .$variable_name. to concatenate the value of the variable with the javascript function at runtime.

 <?php
 function alertText($text) {
 echo "
 <script>
 alert('".$text."');
 </script>
 ";
 }
 alertText("Hello");
 ?>

** EXAMPLE CORRECTED **

Answer 4

You should use it like

 function alertText($text) {
echo '<script type="text/javascript">alert("' . $text . '"); </script>';
";
}
alertText("Hello");
?>