array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'it', ), 'this' => array ( 0 => 'function.boolval.php', 1 => 'boolval', 2 => 'Get the boolean value of a variable', ), 'up' => array ( 0 => 'ref.var.php', 1 => 'Variable handling Funzioni', ), 'prev' => array ( 0 => 'ref.var.php', 1 => 'Variable handling Funzioni', ), 'next' => array ( 0 => 'function.debug-zval-dump.php', 1 => 'debug_zval_dump', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/var/functions/boolval.xml', ), 'history' => array ( ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); contributors($setup); ?>

boolval

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

boolval — Get the boolean value of a variable

Descrizione

boolval(mixed $value): bool

Returns the bool value of value.

Elenco dei parametri

value

The scalar value being converted to a bool.

Valori restituiti

The bool value of value.

Esempi

Example #1 boolval() examples

<?php
echo '0: '.(boolval(0) ? 'true' : 'false')."\n";
echo '42: '.(boolval(42) ? 'true' : 'false')."\n";
echo '0.0: '.(boolval(0.0) ? 'true' : 'false')."\n";
echo '4.2: '.(boolval(4.2) ? 'true' : 'false')."\n";
echo '"": '.(boolval("") ? 'true' : 'false')."\n";
echo '"string": '.(boolval("string") ? 'true' : 'false')."\n";
echo '"0": '.(boolval("0") ? 'true' : 'false')."\n";
echo '"1": '.(boolval("1") ? 'true' : 'false')."\n";
echo '[1, 2]: '.(boolval([1, 2]) ? 'true' : 'false')."\n";
echo '[]: '.(boolval([]) ? 'true' : 'false')."\n";
echo 'stdClass: '.(boolval(new stdClass) ? 'true' : 'false')."\n";
?>

Il precedente esempio visualizzerà:

0:        false
42:       true
0.0:      false
4.2:      true
"":       false
"string": true
"0":      false
"1":      true
[1, 2]:   true
[]:       false
stdClass: true

Vedere anche: