PHP - Speach Marks in Form Problem

I have a form and somebody entered 8" by 15" into it and it stopped my function working.

How can I clean up the posted text before I send it to my function for processing?
lwfukAsked:
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Chris HarteConnect With a Mentor ThaumaturgeCommented:
Use the addslashes function.
If you are writing the content to a database use the mysqli_real_escape_string() instead to prevent injection attacks.
<?php
$str = "Is your name O'reilly?";
 
// Outputs: Is your name O\'reilly?
echo addslashes($str);
?>

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lwfukAuthor Commented:
Many thanks.
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