PHP Logical Operators - PHP Tutorial 28
Notes for You:: PHP Logical Operators - PHP Tutorial 28
- are also known as logical connectives.
- are used to connect one or more conditions.
- accept Boolean operands, on evaluation they yield the result true or false.
&& / and: Logical and Operator:
- If both LHS and RHS operands are true then the result will be true, in all other cases the result will be false.
|| / or: Logical or Operator:
- If both LHS and RHS operands are false then the result will be false, in all other cases the result will be true.
xor : Logical exclusive Or Operator:
- If both are same then the result will be false otherwise true.
!: Logical not Operator:
- If the given operand is false, then the result will be true. Vice versa.
Example code:
echo (true && true) ? "true" : "false", "<br/>"; // true
echo (true && false) ? "true" : "false", "<br/>"; // false
echo (false && true) ? "true" : "false", "<br/>"; // false
echo (false && false) ? "true" : "false", "<br/>"; // false
echo "<br/>";
echo (true || true) ? "true" : "false", "<br/>"; // true
echo (true || false) ? "true" : "false", "<br/>"; // true
echo (false || true) ? "true" : "false", "<br/>"; // true
echo (false || false) ? "true" : "false", "<br/>"; // false
echo "<br/>";
echo (true xor true) ? "true" : "false", "<br/>"; // false
echo (true xor false) ? "true" : "false", "<br/>"; // true
echo (false xor true) ? "true" : "false", "<br/>"; // true
echo (false xor false) ? "true" : "false", "<br/>"; // false
echo "<br/>";
echo (!true) ? "true" : "false","<br/>"; // false
echo (!false) ? "true" : "false","<br/>"; // true
echo "<br/>";
echo ((3<4) && (4<5)) ? "true" : "false","<br/>"; // true
echo ((3<4) and (4<5)) ? "true" : "false","<br/>"; // true
echo "<br/>";
echo ((3>4) || (4>5)) ? "true" : "false","<br/>"; // false
echo ((3>4) or (4>5)) ? "true" : "false","<br/>"; // false
echo "<br/>";
echo (!(3<4)) ? "true" : "false","<br/>"; // false
Note:
- replace < with less-than symbol.
- replace > with greater-than symbol.
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