Pass a PHP string to a JavaScript variable (and escape newlines)

This question already has an answer here:

How to pass variables and data from PHP to JavaScript? 16 answers

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Expanding on someone else's answer:

<script>
  var myvar = <?php echo json_encode($myVarValue); ?>;
</script>

Using json_encode() requires:

PHP 5.2.0 or greater

$myVarValue encoded as UTF-8 (or US-ASCII, of course)

Since UTF-8 supports full Unicode, it should be safe to convert on the fly.

Note that because json_encode escapes forward slashes, even a string that contains </script> will be escaped safely for printing with a script block.

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用JSON编码

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function escapeJavaScriptText($string)
{
    return str_replace("n", 'n', str_replace('"', '"', addcslashes(str_replace("r", '', (string)$string), "..37'")));
}

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