PHP Tutorial - Single, Double Quotes and Concatenation (PHP For Beginners)

In this tutorial you will learn the use of single and double quotes in echo statement also how to concatenate a string in php.

1. Double quote strings will display a host of escaped characters, and variables in the strings will be evaluated.

﹤?php

$name = "tut.julfi.com";

echo "I love $name﹤br﹥";

?﹥

2. to display a back slash, you can escape it with another backslash \\ .

﹤?php

echo "C:\\wamp\\www\\test";

?﹥

List Of escape sequences for special characters :

\$ dollar sign.
\" double-quote.
\n linefeed.
\r carriage return.
\t horizontal tab.
\v vertical tab.
\e escape.
\f form feed.

3. An important point here is that you can use curly braces {} to isolate the name of the variable you want evaluated.For example

﹤?php

$name = "tut.julfi.com";

echo "I love $name﹤br﹥";

echo "I love {$name}";

?﹥

4. Single quoted strings will display things almost completely as is.

﹤?php

$name = "tut.julfi.com";

echo "I love $name﹤br﹥";

echo 'I love $name';

?﹥

5. To solve this problem what you have to do is
put a full stop between the variable name and the printable text associated with it.

﹤?php

$name = "tut.julfi.com";

echo 'I love ' . $name;

$name1 = "julfi.com";

echo 'I love ' . $name . ' and ' . $name1;

?﹥

6. If you to add a link using ﹤a﹥ tag you will need to use single quotes.

﹤?php

echo "﹤a href="tut.julfi.com"﹥Tutorials﹤/a﹥";
// It will show an error.

echo '﹤a href="tut.julfi.com"﹥Tutorials﹤/a﹥';
//It works.
?﹥

﹤?php

$name = "Tutorials";

echo '﹤a href="tut.julfi.com"﹥' . $name . '﹤/a﹥';

?﹥

7. In single quotes variables and most escape sequences will not be interpreted. The exception is that to display a literal single quote, you can escape it with a back slash \' .

﹤?php

echo 'It's raining'; //It will show am error.

echo 'It\'s raining'; // It works.

?﹥

For more information, check out the website:
http://tut.julfi.com/category/php/

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