Menu
I have some DB fields called
picture1_en
picture2_en
...
picture1_de
picture2_de
...
picture1_it
picture2_it
Yes, it could have been implemented in another way, but I cannot change the implementation.
Suppose I have a variable called $lang that contains "de" or "en" or "it"
Now, if I want to print the value, I could use this:
for($i=1; $i<=10; ++$i)
echo $r["picture$i_$lang"];
The problem is that PHP interprets the underscore as part of the variable name (e.g. it interprets it as "$i_"). I tried escaping the underscore in a lot of crazy ways, none of them working.
Sure, I could do
echo $r["picture".$i."_".$lang];
But I was wondering if there is a way to force PHP to interpret the "_" as a string literal, and not as a part of a variable name.
537
A variable name must start with a letter or the underscore character. A variable name cannot start with a number. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive ( $age and $AGE are two different variables)
Variable names should not start with underscore ( _ ) or dollar sign ( $ ) characters, even though both are allowed. This is in contrast to other coding conventions that state that underscores should be used to prefix all instance variables.
In PHP, the underscore is generally reserved as an alias of gettext() (for translating strings), so instead it uses a double-underscore. All the functions that make up the library are available as static methods of a class called __ – i.e., a double-underscore.
A single leading underscore in front of a variable, a function, or a method name means that these objects are used internally. This is more of a syntax hint to the programmer and is not enforced by the Python interpreter which means that these objects can still be accessed in one way on another from another script.
You can use curly braces to separate the variable name boundaries in a string (double quoted only)
$r["picture{$i}_{$lang}"];
or
$r["picture${i}_${lang}"];
http://php.net/manual/en/language.types.string.php
Complex (curly) syntax
Any scalar variable, array element or object property with a string representation can be included via this syntax. Simply write the expression the same way as it would appear outside the string, and then wrap it in { and }. Since { can not be escaped, this syntax will only be recognised when the $ immediately follows the {. Use {\$ to get a literal {$. Some examples to make it clear:
61
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
