Extra linebreak when producing JSON with PHP

Question

I have some chunks of HTML in my database that I put in a JSON this way, upon first page render:

foreach ($data as $key => $value) {
    $output .= '
    "'.$key.'" : "'.addSlashes($value).'",
    ';
}

usually it works fine, except in a few cases where I get a leading line feed like this below:

    "html" : "
    <div id=\"object_01\" class=\"object_textbox\" namn=\"object_01\" style=\"z-index:1;font-family:Arial;left:750.9776000976563px;top:30.979339599609375px;position:absolute;width:709.6444444656372px;height:327.6444444656372px;\"><div class=\"object_inner\" style=\"border:0px solid rgb(0,0,0);background-color:rgb(255,255,255);color:rgb(0,0,0);opacity:.8;font-size:28px;line-height:42px;padding:20px;\">“Behold my Beloved Son, in whom I am well pleased, in whom I have glorified my name—hear ye him.” And it came to pass, as they understood they cast their eyes up again towards heaven; and behold, they saw a Man descending out of heaven; and he was clothed in a white robe; and he came down and stood in the midst of them...</div></div><div id=\"object_02\" class=\"object_textbox\" namn=\"object_02\" style=\"z-index:2;font-family:Arial;position:absolute;top:309.9988098144531px;left:1269.9826049804688px;width:187.6444444656372px;height:48.64444446563721px;\"><div class=\"object_inner\" style=\"border:0px solid rgb(0,0,0);font-style:italic;font-weight:bold;\">3 Nephi 11:7-8</div></div>",

Which obviously breaks the entiry page since javascript doesn't support linefeeds inside strings.

Any idéa what might cause it, or a way around it?

All the data from the database is picked up from a page at form save, so the user never gets to manually insert that linefeed... I just use jQuery element.html() to pick it up so there shouldn't be a linefeed there...

You should definately have a look at json_encode instead.

hank
– hank

2014-07-16 11:31:22 +00:00
Commented Jul 16, 2014 at 11:31 — hank
– hank, Commented Jul 16, 2014 at 11:31

JAAulde · Accepted Answer · 2014-07-16 12:20:56Z

2

Never build JSON "manually". Use the built in function:

<?php
$output = json_encode($data);

One of the reasons JSON is so popular (other than it being so compatible with JavaScript) is that it is a widely supported serialization scheme. Almost every language and platform now have libraries for working with it so that you can reliably serialize and deserialize your data in any environment for any other.

Once you're using json_encode, whatever ends up in that data is what was there before serialization. So if the line break is still there, it's not the serialization causing it--you'll need to find it in your other code/data.

edited Jul 16, 2014 at 12:20

answered Jul 16, 2014 at 11:31

JAAulde

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2 Comments

Matt Welander Over a year ago

Oh.. there is one natively.. thanks =) don't know how I missed that. Making things harder than they need to be here.. =)

Matt Welander Over a year ago

The linefeed was not in my data btw, it was caused by my erroneous way of converting to json.

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