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Difference between single quote and double quote string in php
In PHP, do both ( " ) and ( ' ) have the same effect? I'm new to PHP and I've been using them interchangeably. Can I?
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I'll answer this with a similar question I posted myself... http://stackoverflow.com/questions/3016034/php-linefeeds-n-not-working – ggutenberg Nov 18 '11 at 06:00
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And see also http://php.net/manual/language.types.string.php – mario Nov 18 '11 at 06:02
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@mario this is not "also". this is **the only** place where one have to see. Unlike inadequate answers from amateurs, it is the only reliable source of information. – Your Common Sense Nov 18 '11 at 07:10
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Yes you can use single quoted or double quoted strings but they have some differences. Take a look at php string type.
KV Prajapati
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1An excellent answer. The only answer covers WHOLE difference yet without ridiculous superstitions peddled along. – Your Common Sense Nov 18 '11 at 07:05
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You you can use them interchangeably, however following are differences:
Inside double quotes, php is able to parse variables for example
"Hello $name" // result: Hello [whatever stored in $name eg John]Inside single quotes php is not able to parse variables:
'Hello $name' // result: Hello $name
Since php does not parse variables from single quotes, using single quotes is slightly faster.
More Information:
Sarfraz
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$name = 'Amar';
echo "Hello, $name"; // outputs Hello, Amar
echo 'Hello, $name'; // outputs Hello, $name
Single quotes ( ' ) are faster by a very small margin since they don't need to scan strings for variables.
justin
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What does it mean - "scan strings for variables"? how is it done? we take a string and scan it? why can't we do it while scanning the whole program? – Your Common Sense Nov 18 '11 at 07:01