Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Is PHP's function name case-sensitive or case-insensitive?
Answer:
In PHP, the names of user defined classes/functions, as well as those built in language constructs/keywords such as echo, while, etc., are ALL case-insensitive, e.g.
echo "foo";
ECHO "foo";
eCho "foo";
They are all the same.
Multi-line string in PHP
Answer:
To assign a multi-line string to a variable, is easy with the Heredoc
E.g.
<?php
$text = <<<EOT
<p>
this "is" a 'test'
</p>
EOT;
echo $text;
Sort an array by key in PHP
Answer:
Assume you have an array in PHP as following,
$a = array (
"orange" => 3,
"mango" => 2,
"apple" => 1,
);
You can sort the array by the key, with the ksort function
ksort($a);
Then the array become:
(
"apple" => 1,
"mango" => 2,
"orange" => 3,
);
Turn on all error reporting in PHP
Answer:
Sometimes, when debugging, it is helpful when you need to enable all PHP errors and make them visible in your application (not in the log), you can put the following line at the top of your script.
<?php
error_reporting(E_ALL);
How to check current PHP version in PHP?
Answer:
If your PHP version is after PHP 5.2.7, you can use the PHP_VERSION constant.
echo PHP_VERSION;
Else, you can use the function phpversion()
echo phpversion();
