为什么会出现此PHP语法错误？

Question

Why am I getting this PHP error ?

I'm printing a piece of code of jQuery in PHP and I get the error:

Parse error: syntax error, unexpected '' + str + '' (T_CONSTANT_ENCAPSED_STRING),
expecting ',' or ';' in CODE on line 166 Errors parsing CODE

This is my code:

echo "$('.fc-day[data-date="' + str + '"]').css('background', 
'url(http://www.hiu.edu/skin/default/images/calendar-event-mark.png) right top
no-repeat');";

Answer 1

You should escape the quotes. When you are opening a " quote and want to insert a " inside and echo it, you should escape it as \\"

In your case:

echo "$('.fc-day[data-date="' + str + '"]').css('background', 'url(http://www.hiu.edu/skin/default/images/calendar-event-mark.png) right top no-repeat');";

Should be

echo "$('.fc-day[data-date=\"' + str + '\"]').css('background', 'url(http://www.hiu.edu/skin/default/images/calendar-event-mark.png) right top no-repeat');";

Answer 2

You need to add \\ before " in your code, because script thinks you closed the string stream.

<?php
   echo "$('.fc-day[data-date=\"' + str + '\"]').css('background', 'url(http://www.hiu.edu/skin/default/images/calendar-event-mark.png) right top no-repeat');";
?>