<?php
var_dump( filter_var(1, FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!1) );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var('1', FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!'1') );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var('yes', FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!'yes') );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var(0, FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!0) );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var('0', FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!'0') );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var('no', FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!'no') );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var(true, FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!true) );
echo str_repeat('-', 30) . PHP_EOL;
var_dump( filter_var(false, FILTER_VALIDATE_BOOLEAN) );
var_dump( !(!false) );
- Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
- bool(true)
bool(true)
------------------------------
bool(true)
bool(true)
------------------------------
bool(true)
bool(true)
------------------------------
bool(false)
bool(false)
------------------------------
bool(false)
bool(false)
------------------------------
bool(false)
bool(true)
------------------------------
bool(true)
bool(true)
------------------------------
bool(false)
bool(false)
- Output for 8.3.5
- Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
bool(true)
bool(true)
------------------------------
bool(true)
bool(true)
------------------------------
bool(true)
bool(true)
------------------------------
bool(false)
bool(false)
------------------------------
bool(false)
bool(false)
------------------------------
bool(false)
bool(true)
------------------------------
bool(true)
bool(true)
------------------------------
bool(false)
bool(false)
preferences:
166.52 ms | 402 KiB | 218 Q