This question already has answers here:
What is the difference between single-quoted and double-quoted strings in PHP?
(7 answers)
Closed 8 years ago.
Here's my code:
$jsonData = file_get_contents('http://example.com/bin/serp.php?engine=google&phrase=$name');
It doesn't appear to be using $name correctly. How would I add that variable into my string like I'm trying to do?
Change the single quotes to double quotes. PHP variables are not interpolated when in single quotes.
$jsonData = file_get_contents("http://example.com/bin/serp.php?engine=google&phrase=$name");
You can also use concatenation here:
$jsonData = file_get_contents('http://example.com/bin/serp.php?engine=google&phrase=' . $name);
Either change the single quotes around your string to double quotes:
"http://example.com/bin/serp.php?engine=google&phrase=$name"
Or use string concatenation with the . operator:
'http://example.com/bin/serp.php?engine=google&phrase=' . $name
Both of these techniques are mentioned on PHP's Strings documentation.
Related
This question already has answers here:
Escaping quotation marks in PHP
(7 answers)
How can I prevent SQL injection in PHP?
(27 answers)
Closed 5 years ago.
I have a php variable referring to a string that contains apostrophes, but when I quote this variable, it thinks I am trying to end the string. My variable is reading from an array of table data, so I can not go in and put a "\" before every apostrophe in the table. If $foo contains the string "don't", how do I correctly say '$foo' without it trying to end the string. Thanks.
You are correct in thinking that you need to add escape characters ("\") before the apostrophes.
To do this on the fly with the database data you can use the php function addslashes.
so:
$escapedString = addslashes($string);
You could also do this with the string replace function for higher precision:
$escapedString = str_replace("'", "\'", $string);
You can use PHP's addslashes PHP Manual - Add slashes
$foo = addslashes($foo);
This question already has answers here:
What is the difference between single-quoted and double-quoted strings in PHP?
(7 answers)
Closed 6 years ago.
Afternoon guys!
For some reason Complex (Curly) Syntax in my PHP code doesn't interpreter as variable
function view($name, $data = [])
{
require __DIR__ . '/../app/views/{$name}.view.php';
}
Here is the code I am calling view('index'); the problem is I get this error:
Warning: require(./core/../app/views/{$name}.view.php): failed to open stream
By the way my PHP version before anyone asks is 7.0.13
Thanks for your help!
Your string has to be placed in double quotes (") instead of single quotes ('). Otherwise variables won't be replaced.
Look here:
https://secure.php.net/manual/en/language.types.string.php#language.types.string.syntax.single
Note: Unlike the double-quoted and heredoc syntaxes, variables and escape sequences for special characters will not be expanded when they occur in single quoted strings.
This question already has answers here:
What is the difference between single-quoted and double-quoted strings in PHP?
(7 answers)
Closed 7 years ago.
What is better to use in PHP?
' or "? for something like this:
<?=$json["response"]["players"][0]["personaname"];?>
And this:
$steamid = "";
"Better" really depends on your use cases. In both your example, the single quote is better for the perfomance because you have no $variable interpolation needed.
Otherwise "better" may be a question of style (and a little of performance).
Read the documentation for more : http://php.net/manual/en/language.types.string.php
Better? Well, let's just say that an empty string with single quotes is the most basic string literal you can use. In your example shown, I would use single quoted strings for array elements and the empty string. PHP will know that the string literal is only a string literal, and that nothing else needs to be "interpolated." Better? Who knows.
One place to use "" is with escape sequences such as "\n" .
This question already has answers here:
What is the difference between single-quoted and double-quoted strings in PHP?
(7 answers)
Closed 7 years ago.
This works:
Welcome <?php echo $_GET["name"]; ?><br>
But this doesn't:
'html' => 'Hello $_GET["name"];',
How should I code this?
it should be echo "Hello $_GET['name']";, single quotes show exact values, you can use double quotes if you are using variables.
echo "Hello {$_GET["name"]}";
This should do.
Correction:
Its not a good practice to use double quotes inside double quotes as pointed out in comments. So the correct thing should be Hello {$_GET['name']}
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
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?
Yes you can use single quoted or double quoted strings but they have some differences. Take a look at php string type.
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:
http://php.net/manual/language.types.string.php
$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.