PHP | boolval() Function
Last Updated :
01 Jul, 2019
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The boolval() function is an inbuilt function in PHP which gives the Boolean value for a given expression.
Syntax:
PHP
Output:
boolean boolval( $expr )Parameter: This function accepts only one parameter as shown in above syntax and described below:
- $expr: The expression or the scalar which you want to change into boolean value. It can be a string type, integer type and etc.
- if $expr is evaluated to boolean true it will return TRUE.
- if $expr is evaluated to boolean false it will return FALSE.
- integer – in this 0 is false and everything else is true.
- float – in this 0.0 is false and everything else is true.
- string – “0” and null string are false and everything else is true (even “0.0”)
- array – empty array is false and everything else is true
- object – here null is false and everything else is true
- null – null is always false.
<?php
// PHP program to illustrate
// the boolval() function
echo 'boolval of 3: '.( boolval( 3 )? 'true' : 'false')."\n";
echo 'boolval of -3 : '.( boolval( -3 )? 'true' : 'false')."\n";
echo 'boolval of 0: ' .( boolval( 0 )? 'true' : 'false')."\n";
echo 'boolval of 3.5: '.( boolval( 3.5 )? 'true' : 'false')."\n";
echo 'boolval of -3.5: '.( boolval( -3.5 )? 'true' : 'false' )."\n";
echo 'boolval of 0.0: '.( boolval( 0.0 )? 'true' : 'false' )."\n";
echo 'boolval of "1": '.( boolval( "1" )? 'true' : 'false' )."\n";
echo 'boolval of "0": '.( boolval( "0" )? 'true' : 'false' )."\n";
echo 'boolval of "0.0": '.( boolval( "0.0" )? 'true' : 'false' )."\n";
echo 'boolval of "xyz": '.( boolval( "xyz" )? 'true' : 'false' )."\n";
echo 'boolval of "": '.( boolval( "" )? 'true' : 'false' )."\n";
echo 'boolval of [1, 5]: '.( boolval( [1, 5] )? 'true' : 'false' )."\n";
echo 'boolval of []: '.( boolval( [] )? 'true' : 'false' )."\n";
echo 'boolval of NULL: '.( boolval( NULL )? 'true' : 'false' )."\n";
?>
boolval of 3: true boolval of -3 : true boolval of 0: false boolval of 3.5: true boolval of -3.5: true boolval of 0.0: false boolval of "1": true boolval of "0": false boolval of "0.0": true boolval of "xyz": true boolval of "": false boolval of [1, 5]: true boolval of []: false boolval of NULL: falseReference: http://http://php.net/manual/en/function.boolval.php
