declare boolean php

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1
2<?php
3$foo = True; // assign the value TRUE to $foo
4?>
5
6

1The is_bool() function checks whether a variable is a boolean or not. This function returns true (1) if the variable is a boolean, otherwise it returns false/nothing.

1Booleans can be one of two constants:
2true
3false
4These values are not case sensitive, therefore true is the same as TRUE
5
6booleans are also often used in control structures, either directly or as
7a result of an operation. For example:
8
9if ($waterDrankToday > 3.7) {
10 echo "Good work staying hydrated!";
11 if ($havingABadDay)
12   hug();
13}
14else
15  echo "You should drink more water";

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