This is my code:
<?php
$a = array('chào','thân','ái','và','quyết','thắng');
?>
<script>
var abc = '<?php echo json_encode($a); ?>';
</script>
When run and i got abc variable is:
var abc = '["ch\u00e0o","th\u00e2n","\u00e1i","v\u00e0","quy\u1ebft","th\u1eafng"]';
So, how to convert it's as before? i want to it's become
var abc = '["chào","thân","ái","và","quyết","thắng"]';
There might be you're answer here :
How to decode Unicode escape sequences like "\u00ed" to proper UTF-8 encoded characters?
But why would you translate those escaped sequences, which should be well displayed and correctly translated by php (json_decode) and javascript (JSON.parse) ?
If your php is >= 5.4, you can use the JSON_UNESCAPED_UNICODE flag to encode unicode characters as-is:
var abc = '<?php echo json_encode($a, JSON_UNESCAPED_UNICODE); ?>';
However, the escaped form works just fine and is less error-prone, so I'd suggest that you keep using it.
i want to replace space with - in a tag -->href attribut in php smarty;
that a[key] is dynamic
what is the way?
{$obj->a[key]}
This could be answer for you
{$obj-a[key]|replace:' ':'-'}
http://www.smarty.net/docsv2/en/language.modifier.replace.tpl
you should try this
str_replace() is a php function which replace the character between
sentences. there are basically three argument pass in the function.
First argument: search the character, Second argument: Replacing Character,
Third argument: sentences.
<?php
$str='home and car';
echo ''.str_replace(' ','-',$str).'';
?>
output
jquery code
g is a regex code which replace all the space between the string.
<script>
$("a").each(function() {
var text = $(this).text();
text = text.replace(/ /g, "-");
$(this).prop('href',text);
$(this).text(text);
});
</script>
Output
home-and-car
I am running some ajax that sends escaped text from the client to a php page running on the server. The text has some carriage returns in it. When I echo these out using php they show up in the text as \n.
However when I try to replace \n using str_replace, the function does not find them.
This has been driving me crazy.
By contrast, I manually created a variable in the same php file with a bunch of \n s in it and in that case the same str_replace code replaced them fine.
Could there be some invisible characters or something throwing it off?
Thanks for any suggestions.
Following replace (all in PHP) works fine
$var = "some text\nsomemore text\nsome more text\nsome more";
echo $var; //displays above text
$strComma = str_replace("\n",",",$var);
echo "strComma".$strComma; \\all of the \n instances are replaced by comma
Following replace does not work
javascript (abbreviated)
var text = document.getElementById(textbox).value; //grabs text from client html
var text2 = escape(text); //escape needed to handle special characters in text
//send to php page
xmlhttp.open("GET","storetext.php?text="+text2,true);
xmlhttp.send();
PHP
$var = $_REQUEST['text'];
echo $var; //displays \n as above. So far so good.
$strComma = str_replace("\n",",",$var);
echo "strComma".$strComma; \\ replacement does not take place
This should work:
$strComma = str_replace("\\n",",",$var);
Two backslashes and then the n character. Like escaping the escape sequence.
When I try with str_replace nothing changes, but using preg_replace it does like this
$strComma = preg_replace("/\n/",",",$var);
ok, html
<html>
<head>
<script src="../../js/jquery_1_8_min.js" type="text/javascript"></script>
</head>
<body>
<script>
text = "some text\nsomemore text\nsome more text\nsome more";
text2 = escape(text)
$.post('lixo.php?'+Math.random(),{text:text2}, function(data) {
alert(data);
});
</script>
</body>
</html>
php
<?php
$var = $_POST["text"];
echo $var; //displays above text
$strComma = preg_replace("/%0A/",",",$var);
$strComma = preg_replace("/%20/",",",$var);
echo "<br>strComma = ".$strComma;
?>
when you escape your text \n becames %0A and white space becames %20
better php
<?php
$var = $_POST["text"];
echo $var."<br>";
$patterns = array();
$patterns[0] = "/%0A/";
$patterns[1] = "/%20/";
$replacements = array();
$replacements[0] = ",";
$replacements[1] = " ";
$strComma = preg_replace($patterns, $replacements,$var);
echo "<br>strComma = ".$strComma;
?>
I'm using PHP to generate a Javascript button that adds in a checkbox and some other HTML.
What is the proper way to escape these characters to include them in an onclick event?
I saw it suggested to convert ' and " to the ascii values, but that doesn't seem to have helped.
$tempOutput = "<a href='temp.txt'>\"Happy\"</a>";
$tempOutput = str_replace("'", "'", $tempOutput);
$tempOutput = str_replace('"', """, $tempOutput);
just results in this if you echo the string right before use:
<a href='temp.txt'>"Happy"</a>
and this if you inspect the page element:
<a onclick="
var divTag = document.createElement('div');
divTag.innerHTML = '<a href='temp.txt'>"Happy"</a>';
document.getElementById('extraDiv').appendChild(divTag) ;
">test</a>
I've also tried just appending to the extradiv's innerHTML but no success there either.
I mostly use PHPs rawurlencode() and Javascript's unescape():
<?php
$tempOutput = ''.htmlentities('"Happy"').'';
?>
<a onclick="
var divTag = document.createElement('div');
divTag.innerHTML = unescape('<?php echo rawurlencode($tempOutput);?>');
document.getElementById('extraDiv').appendChild(divTag) ;
">test</a>
<div id="extraDiv"></div>
This will also avoid errors with other chars, e.g. linebreaks.
Escape like this
$tempOutput = str_replace(array("'",'"'), array("\'",'"'), $tempOutput);
use html_entity_decode
Is there any reasons why PHP's json_encode function does not escape all JSON control characters in a string?
For example let's take a string which spans two rows and has control characters (\r \n " / \) in it:
<?php
$s = <<<END
First row.
Second row w/ "double quotes" and backslash: \.
END;
$s = json_encode($s);
echo $s;
// Will output: "First row.\r\nSecond row w\/ \"double quotes\" and backslash: \\."
?>
Note that carriage return and newline chars are unescaped. Why?
I'm using jQuery as my JS library and it's $.getJSON() function will do fine when you fully, 100% trust incoming data. Otherwise I use JSON.org's library json2.js like everybody else.
But if you try to parse that encoded string it throws an error:
<script type="text/javascript">
JSON.parse(<?php echo $s ?>); // Will throw SyntaxError
</script>
And you can't get the data! If you remove or escape \r \n " and \ in that string then JSON.parse() will not throw error.
Is there any existing, good PHP function for escaping control characters. Simple str_replace with search and replace arrays will not work.
function escapeJsonString($value) {
# list from www.json.org: (\b backspace, \f formfeed)
$escapers = array("\\", "/", "\"", "\n", "\r", "\t", "\x08", "\x0c");
$replacements = array("\\\\", "\\/", "\\\"", "\\n", "\\r", "\\t", "\\f", "\\b");
$result = str_replace($escapers, $replacements, $value);
return $result;
}
I'm using the above function which escapes a backslash (must be first in the arrays) and should deal with formfeeds and backspaces (I don't think \f and \b are supported in PHP).
D'oh - you need to double-encode: JSON.parse is expecting a string of course:
<script type="text/javascript">
JSON.parse(<?php echo json_encode($s) ?>);
</script>
I still haven't figured out any solution without str_replace..
Try this code.
$json_encoded_string = json_encode(...);
$json_encoded_string = str_replace("\r", '\r', $json_encoded_string);
$json_encoded_string = str_replace("\n", '\n', $json_encoded_string);
Hope that helps...
$search = array("\n", "\r", "\u", "\t", "\f", "\b", "/", '"');
$replace = array("\\n", "\\r", "\\u", "\\t", "\\f", "\\b", "\/", "\"");
$encoded_string = str_replace($search, $replace, $json);
This is the correct way
Converting to and fro from PHP should not be an issue.
PHP's json_encode does proper encoding but reinterpreting that inside java script can cause issues. Like
1) original string - [string with nnn newline in it] (where nnn is actual newline character)
2) json_encode will convert this to
[string with "\\n" newline in it] (control character converted to "\\n" - Literal "\n"
3) However when you print this again in a literal string using php echo then "\\n" is interpreted as "\n" and that causes heartache. Because JSON.parse will understand a literal printed "\n" as newline - a control character (nnn)
so to work around this: -
A)
First encode the json object in php using json_enocde and get a string. Then run it through a filter that makes it safe to be used inside html and java script.
B)
use the JSON string coming from PHP as a "literal" and put it inside single quotes instead of double quotes.
<?php
function form_safe_json($json) {
$json = empty($json) ? '[]' : $json ;
$search = array('\\',"\n","\r","\f","\t","\b","'") ;
$replace = array('\\\\',"\\n", "\\r","\\f","\\t","\\b", "'");
$json = str_replace($search,$replace,$json);
return $json;
}
$title = "Tiger's /new \\found \/freedom " ;
$description = <<<END
Tiger was caged
in a Zoo
And now he is in jungle
with freedom
END;
$book = new \stdClass ;
$book->title = $title ;
$book->description = $description ;
$strBook = json_encode($book);
$strBook = form_safe_json($strBook);
?>
<!DOCTYPE html>
<html>
<head>
<title> title</title>
<meta charset="utf-8">
<script type="text/javascript" src="/3p/jquery/jquery-1.7.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var strBookObj = '<?php echo $strBook; ?>' ;
try{
bookObj = JSON.parse(strBookObj) ;
console.log(bookObj.title);
console.log(bookObj.description);
$("#title").html(bookObj.title);
$("#description").html(bookObj.description);
} catch(ex) {
console.log("Error parsing book object json");
}
});
</script>
</head>
<body>
<h2> Json parsing test page </h2>
<div id="title"> </div>
<div id="description"> </div>
</body>
</html>
Put the string inside single quote in java script. Putting JSON string inside double quotes would cause the parser to fail at attribute markers (something like { "id" : "value" } ). No other escaping should be required if you put the string as "literal" and let JSON parser do the work.
I don't fully understand how var_export works, so I will update if I run into trouble, but this seems to be working for me:
<script>
window.things = JSON.parse(<?php var_export(json_encode($s)); ?>);
</script>
Maybe I'm blind, but in your example they ARE escaped. What about
<script type="text/javascript">
JSON.parse("<?php echo $s ?>"); // Will throw SyntaxError
</script>
(note different quotes)
Just an addition to Greg's response: the output of json_encode() is already contained in double-quotes ("), so there is no need to surround them with quotes again:
<script type="text/javascript">
JSON.parse(<?php echo $s ?>);
</script>
Control characters have no special meaning in HTML except for new line in textarea.value . JSON_encode on PHP > 5.2 will do it like you expected.
If you just want to show text you don't need to go after JSON. JSON is for arrays and objects in JavaScript (and indexed and associative array for PHP).
If you need a line feed for the texarea-tag:
$s=preg_replace('/\r */','',$s);
echo preg_replace('/ *\n */','
',$s);
This is what I use personally and it's never not worked. Had similar problems originally.
Source script (ajax) will take an array and json_encode it. Example:
$return['value'] = 'test';
$return['value2'] = 'derp';
echo json_encode($return);
My javascript will make an AJAX call and get the echoed "json_encode($return)" as its input, and in the script I'll use the following:
myVar = jQuery.parseJSON(msg.replace(/"/ig,'"'));
with "msg" being the returned value. So, for you, something like...
var msg = '<?php echo $s ?>';
myVar = jQuery.parseJSON(msg.replace(/"/ig,'"'));
...might work for you.
There are 2 solutions unless AJAX is used:
Write data into input like and read it in JS:
<input type="hidden" value="<?= htmlencode(json_encode($data)) ?>"/>
Use addslashes
var json = '<?= addslashes(json_encode($data)) ?>';
When using any form of Ajax, detailed documentation for the format of responses received from the CGI server seems to be lacking on the Web. Some Notes here and entries at stackoverflow.com point out that newlines in returned text or json data must be escaped to prevent infinite loops (hangs) in JSON conversion (possibly created by throwing an uncaught exception), whether done automatically by jQuery or manually using Javascript system or library JSON parsing calls.
In each case where programmers post this problem, inadequate solutions are presented (most often replacing \n by \\n on the sending side) and the matter is dropped. Their inadequacy is revealed when passing string values that accidentally embed control escape sequences, such as Windows pathnames. An example is "C:\Chris\Roberts.php", which contains the control characters ^c and ^r, which can cause JSON conversion of the string {"file":"C:\Chris\Roberts.php"} to loop forever. One way of generating such values is deliberately to attempt to pass PHP warning and error messages from server to client, a reasonable idea.
By definition, Ajax uses HTTP connections behind the scenes. Such connections pass data using GET and POST, both of which require encoding sent data to avoid incorrect syntax, including control characters.
This gives enough of a hint to construct what seems to be a solution (it needs more testing): to use rawurlencode on the PHP (sending) side to encode the data, and unescape on the Javascript (receiving) side to decode the data. In some cases, you will apply these to entire text strings, in other cases you will apply them only to values inside JSON.
If this idea turns out to be correct, simple examples can be constructed to help programmers at all levels solve this problem once and for all.