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+---
+title: PHP
+date: "2024-02-26"
+sidebar: auto
+tags:
+  - PHP
+---
+
+# PHP
+
+{introduction}
+
+PHP demands the `<?php` to initialize the file and `;` in the end of the command (line).
+
+```php
+<?php
+
+echo "Hello, world!";
+```
+
+## Variables
+
+It is not necessary to declare the data type.
+
+```php
+$variableName = <data>;
+$name = "Guilherme";
+$age = 666;
+
+//print variable:
+echo $age;
+```
+
+## Operators
+
+### Arithmetic operators
+
+| Operator   | Description                    |
+|------------|--------------------------------|
+| `+`        | Addition.                      |
+| `-`        | Subtraction.                   |
+| `*`        | Multiplication.                |
+| `/`        | Division.                      |
+| `%`        | Modulus (Remainder).           |
+| `**`       | Exponentiation (PHP 5.6+).     |
+
+### Assignment operators
+
+| Operator   | Description                                |
+|------------|--------------------------------------------|
+| `=`        | Assignment.                                |
+| `+=`       | Addition assignment.                       |
+| `-=`       | Subtraction assignment.                    |
+| `*=`       | Multiplication assignment.                 |
+| `/=`       | Division assignment.                       |
+| `%=`       | Modulus assignment.                        |
+| `.=`       | Concatenation assignment (for strings).    |
+| `**=`      | Exponentiation assignment (PHP 7.6+).      |
+
+### Comparision operators
+
+| Operator   | Description                        |
+|------------|------------------------------------|
+| `==`       | Equal to.                          |
+| `===`      | Identical to.                      |
+| `!=`       | Not equal to.                      |
+| `!==`      | Not identical to.                  |
+| `>`        | Greater than.                      |
+| `<`        | Less than.                         |
+| `>=`       | Greater than or equal to.          |
+| `<=`       | Less than or equal to.             |
+| `<=>`      | Spaceship (Combined comparison).   |
+| `??`       | Null coalescing operator (PHP 7+). |
+
+### Logical operators
+
+| Operator      | Description    |
+|---------------|----------------|
+| `&&` or `and` | Logical AND.   |
+| `||` or `or`  | Logical OR.    |
+| `!` or `not`  | Logical NOT.   |
+| `xor`         | Logical XOR.   |
+
+> The `xor` operator return `true` if at least one operand is true.
+
+### Bitwise operators
+
+| Operator   | Description    |
+|------------|----------------|
+| `&`        | Bitwise AND.   |
+| `\|`       | Bitwise OR.    |
+| `^`        | Bitwise XOR.   |
+| `~`        | Bitwise NOT.   |
+| `<<`       | Left shift.    |
+| `>>`       | Right shift.   |
+
+### Increment/Decrement operators
+
+| Operator   | Description    |
+|------------|----------------|
+| `++`       | Increment.     |
+| `--`       | Decrement.     |
+
+### String operator
+
+| Operator   | Description                                        |
+|------------|----------------------------------------------------|
+| `.=`       | Concatenation assignment (for strings).            |
+
+### Array operators
+
+| Operator   | Description                          |
+|------------|--------------------------------------|
+| `+`        | Union.                               |
+| `==`       | Equality.                            |
+| `===`      | Identity.                            |
+| `!=`       | Inequality.                          |
+| `!==`      | Non-identity.                        |
+
+### Type operator
+
+| Operator     | Description                    |
+|--------------|--------------------------------|
+| `instanceof` | Type of (Type Operator).       |
+