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How to output JavaScript with PHP

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无人及你
无人及你 2020-11-27 06:16

I am new to PHP. I need to output the following JavaScript with PHP. This is my code:
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12条回答
  • 萌比男神i
    2020-11-27 06:52

    You should escape the JavaScript string delimiters inside the PHP string. You're using double quotes for both PHP and JavaScript strings. Try like this instead:

    <html>
<body>
<?php

// Here, we use single quotes for PHP and double quotes for JavaScript
echo '<script type="text/javascript">';
echo 'document.write("Hello World!")';
echo '</script>';

?>
</body>
</html>

    You have to escape quotes on both JavaScript and PHP when the string delimiter are the same as the quotes:

    echo "\""; // escape is done using a backslash
echo '\'';

    Same in JavaScript:

    alert("\""); // escape is done using a backslash
alert(echo '\'');

    But because it's very hard to read a string with such escape sequences, it is better to combine single with double quotes, as needed:

    echo '"';
echo "'";
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  • 傲寒
    2020-11-27 06:52

    You are using " instead of ' It is mixing up php syntax with javascript. PHP is going to print javascript with echo function, but it is taking the js codes as wrong php syntax. so try this,

    <html>
<body>
<?php

echo "<script type='text/javascript'>";
echo "document.write('Hello World!')";
echo "</script>";

?>
</body>
</html>
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  • 无人共我
    2020-11-27 06:58

    You need to escape the double quotes like this:

    echo "<script type=\"text/javascript\">";
echo "document.write(\"Hello World!\")";
echo "</script>";

    or use single quotes inside the double quotes instead, like this:

    echo "<script type='text/javascript'>";
echo "document.write('Hello World!')";
echo "</script>";

    or the other way around, like this:

    echo '<script type="text/javascript">';
echo 'document.write("Hello World!")';
echo '</script>';

    Also, checkout the PHP Manual for more info on Strings.

    Also, why would you want to print JavaScript using PHP? I feel like there's something wrong with your design.

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  • 野趣味
    2020-11-27 07:00

    You want to do this:

    <html>
<body>
<?php

print '
<script type="text/javascript">
document.write("Hello World!")
</script>
';

?>
</body>
</html>
    0 讨论(0)
  • 故里飘歌
    2020-11-27 07:02

    instead you could easily do it this way :

    <html>
<body>
<script type="text/javascript">
<?php
  $myVar = "hello";
?>
   document.write("<?php echo $myVar ?>");
</script>
</body>
    0 讨论(0)
  • 死守一世寂寞
    2020-11-27 07:06

    You need to escape your quotes.

    You can do this:

    echo "<script type=\"text/javascript\">";

    or this:

    echo "<script type='text/javascript'>";

    or this:

    echo '<script type="text/javascript">';

    Or just stay out of php

    <script type="text/javascript">
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