PHP single double quote difference, PHP double quote Difference
in PHP, the definition of a string can use single quotation marks ' ' in English , you can also use double quotes " " in English .
However, you must use the same single or double
(1) What is the difference between single and double quotation marks?1, can be used to escape the range, the single quotation mark can only escape the single quotation mark \ ', double quotation marks except single quotation mark cannot escape,
1. Define String
In PHP, a string can be defined using single quotes or double quotes. However, you must use the same single or double quotes to define the string, such as: ' Hello ' and ' hello ' are illegal string definitions.
When you define
The difference between single quotation marks and double quotes in PHP
In a programming language, both single and double quotes are important, as is the case in the PHP language. Compared to ASP, PHP quotation marks better use, in ASP, to put the
1. Defining Strings
In PHP, the definition of a string can use either single quotation marks or double quotes. However, you must use the same single or double quotation marks to define strings, such as: ' Hello ' and ' hello ' are illegal
About the difference between single and double quotation marks and efficiency issues. A lot of friends understand is not very clear, always thought that single quotation marks and double quotes in PHP are interoperable, until one day, found that
(1) What is the difference between single and double quotation marks?
1, can be used to escape the range, the single quotation mark can only escape the single quotation mark \ ', double quotation marks except single quotation mark cannot escape,
character preceded by backslash, including single quote, double quote, backslash PHP Tutorial code
function D_addslashes ($string, $force = 0) {
if (! $globals [' MAGIC_QUOTES_GPC '] | | $force) {
if (Is_array ($string)) {
foreach ($string as
In PHP, single and double quotes are not interoperable, the specific difference is as follows:
The fields inside the double quotes are interpreted by the compiler and then exported as HTML code.
' Single quotes inside without explanation, direct
PHP Jsonp single quote escape, JSONP quote escape
PHP JSONP output is generally in the following format:
Callbackname (' JSON string ');
If the middle JSON string contains single quotes, this output is problematic and the caller is generally unable
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