What is the difference between php and js

The difference between php and js

1. PHP uses dots to spell strings. js uses numbers.

2. The php file should be placed in the www in the wamp file.

3. The embedding methods of php and js are the same, but the embedded tags are different.

4. PHP output syntax uses echo. Multiple strings can be output. Special output method var_dump().

5. PHP uses $ to define variables.

6. PHP’s special definition method

$variable=<<A;

Please note that the following A must be written in the upper case.

7. echo “he”\llo” PHP parses and escapes double quotes, but single quotes cannot.

8. PHP force conversion string string For example $a=(string)$ a;settype($a,"string");

9. Commonly used functions for PHP variables

unset($a); Delete variables

var_dump(isset($a )); Determine whether the variable exists;

var_dump(empty($a)); Determine if it is empty, the variable does not exist, the variable is equal to zero, and the empty string is empty.

10. PHP variable takes the address & represents the variable takes the address For example: $a=10; $b=&$a; echo $b; This way the output variable is 10.

11. PHP variable variable For example $a ="hello"; $hello="Zhang San"; echo $$a; This way the output is Zhang San.

12. @ in php represents the suppressed error symbol

13. Trinocular arithmetic Symbol

$a = 10;

echo $a==10?"OK":"NO";

14. PHP error message:

Notice Reminder 　　

Warning 　　　　　

Error Error

Recommended tutorial: PHP video tutorial

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