How to convert numeric value to boolean type in php

Conversion: 1. Use the double logical NOT operator with the syntax "!!Number to be converted"; 2. Add the target type "(bool)" enclosed in parentheses before the numerical variable to be converted. Or "(boolean)", for example "(bool) value"; 3. Use the boolval() function, the syntax is "boolval (value)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php converts numerical values For Boolean type

1, use the double logical NOT operator "!!"

to perform a Boolean value Negation operation. For example: !true = false, !false = true, !10 = false.

<?php
var_dump(!!2);  //返回true
var_dump(!!0);  //返回false
var_dump(!!1);  //返回true
?>

2. Add the target type "(bool)" or "(boolean)" enclosed in parentheses before the conversion variable

• (bool), (boolean): Convert to Boolean type

<?php
var_dump((bool)2);  //返回true
var_dump((bool)0);  //返回false
var_dump((bool)1);  //返回true
var_dump((bool)100);  //返回true
?>

3. Use boolval() function

boolval(): used to obtain the Boolean value of the variable;

<?php
echo &#39;0:        &#39;.(boolval(0) ? &#39;true&#39; : &#39;false&#39;)."<br>";
echo &#39;42:       &#39;.(boolval(42) ? &#39;true&#39; : &#39;false&#39;)."<br>";
echo &#39;0.0:      &#39;.(boolval(0.0) ? &#39;true&#39; : &#39;false&#39;)."<br>";
echo &#39;4.2:      &#39;.(boolval(4.2) ? &#39;true&#39; : &#39;false&#39;)."<br>";
echo &#39;"0":      &#39;.(boolval("0") ? &#39;true&#39; : &#39;false&#39;)."<br>";
echo &#39;"1":      &#39;.(boolval("1") ? &#39;true&#39; : &#39;false&#39;)."<br>";
?>

Output result:

0:        false
42:       true
0.0:      false
4.2:      true
"0":      false
"1":      true

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