php is false
-1 se considera TRUE , como cualquier otro número distinto de cero (ya sea negativo o positivo). <?php var_dump((bool) ""); // bool(false) ,Returns TRUE if var is a boolean, FALSE otherwise. Examples ¶. Example #1 is_bool() examples. <?php $a = ... , The triple-equal operator is type-sensitive. So when you check: if ($check === false) ... it will only be true if $check is the boolean value "false".,Converting to boolean ¶ To explicitly convert a value to boolean, use the (bool) or (boolean) casts. ... When converting to boolean, the following values are considered FALSE : the boolean FALSE itself. the integers 0 and -0 (zero) ,FALSE is a boolean while "false" is a string. Note: HTML Forms do not pass integers, floats, or booleans; they pass strings. To find out if a string is numeric, you may use is_numeric(). , 在使用这些表格之前，需要明白变量类型及它们的意义。例如， "42" 是一个字符串而 42 是一个整数。 FALSE 是一个布尔值而 "false ..., PHP的Null、False和0比較. e-satis: Null means "nothing". The var has not been initialized. Null 意思是nothing。這個變數還沒被初始化。,在其他程式語言裡, 有另外的值可用來判斷是/否, 如1 代表TRUE, 0 代表FALSE. PHP 也支援/接受其他型別的變數用來在程式中判斷, 以下的變數值就等於FALSE ...
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 php is false 相關參考資料
Booleanos - Manual - PHP
-1 se considera TRUE , como cualquier otro número distinto de cero (ya sea negativo o positivo). <?php var_dump((bool) ""); // bool(false) https://www.php.net is_bool - Manual - PHP
Returns TRUE if var is a boolean, FALSE otherwise. Examples ¶. Example #1 is_bool() examples. <?php $a = ... https://www.php.net PHP - Checking for return false; - Stack Overflow
The triple-equal operator is type-sensitive. So when you check: if ($check === false) ... it will only be true if $check is the boolean value "false". https://stackoverflow.com PHP: Booleans - Manual - PHP.net
Converting to boolean ¶ To explicitly convert a value to boolean, use the (bool) or (boolean) casts. ... When converting to boolean, the following values are considered FALSE : the boolean FALSE itsel... https://www.php.net PHP: PHP type comparison tables - Manual - PHP.net
FALSE is a boolean while "false" is a string. Note: HTML Forms do not pass integers, floats, or booleans; they pass strings. To find out if a string is numeric, you may use is_numeric(). https://www.php.net PHP判断和比较null、0、''、false的正确姿势- 歪麦博客
在使用这些表格之前，需要明白变量类型及它们的意义。例如， "42" 是一个字符串而 42 是一个整数。 FALSE 是一个布尔值而 "false ... https://www.awaimai.com PHP的Null、False和0比較 - 老天尊的死期
PHP的Null、False和0比較. e-satis: Null means "nothing". The var has not been initialized. Null 意思是nothing。這個變數還沒被初始化。 http://carlislebear.blogspot.c 【PHP】關於布林值TRUE FALSE - 老灰鴨的筆記本
在其他程式語言裡, 有另外的值可用來判斷是/否, 如1 代表TRUE, 0 代表FALSE. PHP 也支援/接受其他型別的變數用來在程式中判斷, 以下的變數值就等於FALSE ... http://oldgrayduck.blogspot.co |