Tags
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<?php // PHP Code ?> |
Never use the close tag at the end of one file to avoid extra white-space
Variables and constants
Variables
Variables are represented by a $ followed by the variable’s name. It’s case-sensitive.
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$var1 = 123; // Asign 123 to $var1; $var2 &= $var1; // Reference $var1 via $var2; unset($var1); // Unset $var1 |
Constants
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define('CONSTANT', 123); |
Types
Booleans
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$var = true; // true $var = false; // false |
Integers
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$a = 1234; // decimal number $var = -123; // a negative number $var = 0123; // octal number (equivalent to 83 decimal) $var = 0x1A; // hexadecimal number (equivalent to 26 decimal) $var = 0b11111111; // binary number (equivalent to 255 decimal) |
Floats
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$var = 1.234; $var = 1.2e3; $var = 7E-10; |
Strings
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$var = 'this is a simple quoted string' $var = "double quoted string"; $var = "with a variable : $myVar"; $var = "with a escaped character : \n"; $var = <<<EOD Example of string spanning multiple lines using heredoc syntax. EOD; |
Arrays
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$var = []; // Empty array $var = array(); // Empty array $var = ['one', 'two', 'three', 'four']; // Classic array $var = array('one', 'two', 'three', 'four'); // Classic array $var = ['key1' => 'value1', 'key2' => 'value2']; // Associative array $var = [1, true, 'three', 4.00]; |
Objects
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$var = new myObject(); $var = new myObject($param); |
Resource
A resource is a special variable, holding a reference to an external resource.
null
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$var = null; |
Callables
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$var = function() { echo "toto"; } |
Operators
Commons
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-$a; // Negation $a + $b; // Addition $a - $b; // Subtraction $a * $b; // Multiplication $a / $b; // Division $a % $b; // Modulus $a ** $b; // Exponentiation $a . $b; // Concatenation |
Bitwise
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$a & $b; // And $a | $b; // Or $a ^ $b; // Xor ~$a; // Not $a << $b; // Shift left $a >> $b; // Shift right |
Assignment
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$a = $b; $a += $b; // $a = $a + $b $a -= $b; // $a = $a - $b $a *= $b; // $a = $a * $b $a /= $b; // $a = $a / $b $a %= $b; // $a = $a % $b $a .= $b; // $a = $a . $b $a &= $b; // $a = $a & $b $a |= $b; // $a = $a | $b $a ^= $b; // $a = $a ^ $b $a <<= $b; // $a = $a << $b $a >>= $b; // $a = $a >> $b |
Comparison
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$a == $b; // Equal $a === $b; // Identical $a != $b; // Not equal $a <> $b; // Not equal $a !== $b; // Not identical $a < $b; // Less than $a > $b; // Greater than $a <= $b; // Left than or equal $a >= $b; // Greater than or equal $a <=> $b; // Spaceship |
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