': Single quotes
": Double quotes
1. When using single quotes to output text, the contents of quotes are all treated as text,
eg
<?php
$face = "Interview technology";
Echo ' <a href= "Http://blog.csdn.net/illman" target= "blank" > $face </a>/n<a href= "http://blog.csdn.net "target=" blank ">csdn blog</a>";
?>
The code to print to the page will be complete:
<a href= "Http://blog.csdn.net/illman" target= "blank" > $face </a>/n<a href= "Http://blog.csdn.net" target= "Blank" >csdn blog</a>
PS: This time, the variable ^ ^ will only be directly when the text output, and not replaced by the relevant value "interview technology", while the escape character "n" line break, will be directly output, not converted to the target character
2. When you use double quotes to output text,
eg
<?php
$face = "Interview technology";
echo "<a href=/" http://blog.csdn.net/illman/"target=/" blank/"> $face </a>/n<a href=/" http:// blog.csdn.net/"target=/" blank/">csdn blog</a>";
?>
The code to print to the page will be like this:
<a href= "Http://blog.csdn.net/illman" target= "blank" > Interview technology </a>
<a href= "http://blog.csdn.net" target= "blank" >csdn blog</a>
PS: Here we can see that when we use double quotes, the variable ^ ^ is replaced with the variable "interview technique" when it is printed to the screen, and the "n" line symbol is converted into a newline. However, the double quotes of the tagged values in HTML are sensitive, so it is Or you can use single quotes instead, HTML tags in the value of the double quotes, so as to avoid the symbol sensitivity.
3. Looking at the difference between the single and double quotes in the PHP page, we can reasonably deploy when the single quotation mark is used, and when the double quotes are used. Thus making it more efficient for you to write programs.
