PHP and Java are generally used for vastly different purposes. However they share a fairly common syntax based on C++. If you use both, here are some differences to remember.
A simple PHP function might be
public function add_three_numbers($x, $y, $z)
{
$answer = $x + $y + $z;
print('foobar message'.$answer."\n");
return $answer;
}
...
$sum = $this->add_three_numbers(1, 2, 3);
while the Java equivalent is
public int addThreeNumbers(int x, int y, int z)
{
int answer = x + y + z;
System.out.println("foobar message" + answer);
return answer;
}
...
int sum = this.addThreeNumbers(1, 2, 3);
The differences in the preceding functions are:
| Feature | PHP | Java |
|---|---|---|
| string quotes | single ' or double quotes " | ONLY double quotes " |
| string concatenation | . | + |
| variable prefix | $ | n/a |
| variable type | loose | strong ie. int, float, string, etc |
| function invocation | -> (:: for static methods) | . |
| function return type | n/a | needed - void, int, etc. |
| function signature | 'function' keyword | n/a |
| function naming | mixed - camelCase or underscores | usually camelCase |
| printing to console | print, echo, print_r, var_dump | System.out.println, System.err.println |
Another key Java concept is the package system, using package, import statements to get qualified namespaces.
In PHP, namespaces are new to 5.3, but not yet widely used. require, require_once, include, include_once statements are used and everything is global.
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