英文:
Whats the difference between intval and floatval?
问题
我测试这段代码时看不出任何差异
$stock_threshold = get_post_meta( $product->get_id(), '_out_of_stock_threshold', true );
$new_stock_quantity = $product->get_stock_quantity() - intval($stock_threshold);
var_dump( $new_stock_quantity );
更新： 我不需要小数位，只需要库存数量为整数。无论哪种方法，都没有错误，只是想知道它们之间的区别，但我认为我需要使用这个是因为数据库中存在负的库存水平，如-35，而数据库不接受减号。
我被迫使用intval()来避免出现数字错误：遇到非数字值。
$stock_threshold = 2
$new_stock_quantity = 8
英文:
I see no difference when testing this code
$stock_threshold = get_post_meta( $product->get_id(), '_out_of_stock_threshold', true );
$new_stock_quantity = $product->get_stock_quantity() - intval($stock_threshold);
var_dump( $new_stock_quantity );
Update : I don't need decimal places, only whole numbers for stock quantity. I have no errors using either, just wanted to know the difference but i assume the reason i need to use this is because of the negative stock levels in the database like - 35 where the DB doesn't like a minus sign.
I've been forced to use intval() to avoid numeric the error : non-numeric value encountered.
$stock_threshold = 2
$new_stock_quantity = 8
答案1
得分: 1
intval: intval() 函数返回一个变量的整数值。
参数值：
- variable - 必需。指定要检查的变量。
- base - 可选。指定用于转换的基数。仅当变量为字符串时才会生效。默认基数为10。
-> 成功时返回变量的整数值，失败时返回0。一个空数组将返回0，非空数组将返回1。它接受一个变量作为参数并返回其整数值。如果变量包含以数字值开头的字符串，它将返回该字符串的整数值。如果变量包含浮点数，它将返回该浮点数的整数部分。如果变量包含非数值值，它将返回0。
示例：
echo intval(35) . "<br>"; // 输出: 35
echo intval(3.5) . "<br>"; // 输出: 3
echo intval("35.2") . "<br>"; // 输出: 35
echo intval(array()) . "<br>"; // 输出: 0
echo intval(array("red", "green", "blue")) . "<br>"; // 输出: 1
floatval: floatval() 函数返回一个变量的浮点数值。
参数值：
- variable - 必需。指定要检查的变量。必须是标量类型。
-> 成功时返回变量的浮点数值，失败时返回0。一个空数组将返回0，非空数组将返回1。它接受一个变量作为参数并返回其浮点数值。如果变量包含以数字值开头的字符串，它将返回该字符串的浮点数值。如果变量包含整数，它将将其转换为浮点数。如果变量包含非数值值，它将返回0。
示例：
echo floatval("235.567889") . "<br>"; // 输出: 235.567889
echo floatval("235.567889Example") . "<br>"; // 输出: 235.567889
echo floatval(35.56) . "<br>"; // 输出: 35.56
echo floatval("Example123") . "<br>"; // 输出: 0
英文:
intval: The intval() function returns the integer value of a variable.
Parameter Values:
variable - Required. Specifies the variable to check
base - Optional. Specifies the base to use for the conversion. Only has an effect if the variable is a string. The default base is 10
-> The integer value of the variable on success, 0 on failure. An empty array will return 0, and a non-empty array will return 1. It takes a variable as an argument and returns its integer value. If the variable contains a string that starts with a numeric value, it will return the integer value of that string. If the variable contains a float, it will return the integer portion of that float. If the variable contains a non-numeric value, it will return 0.
Examples:
echo intval(35) . "<br>"; // output: 35
echo intval(3.5) . "<br>"; // output: 3
echo intval("35.2") . "<br>"; // output: 35
echo intval(array()) . "<br>"; // output: 0
echo intval(array("red", "green", "blue")) . "<br>"; // output: 1
floatval: The floatval() function returns the float value of a variable.
Parameter Values:
variable - Required. Specifies the variable to check. Must be a scalar type
-> The float value of the variable on success, 0 on failure. An empty array will return 0, and a non-empty array will return 1. It takes a variable as an argument and returns its floating-point value. If the variable contains a string that starts with a numeric value, it will return the floating-point value of that string. If the variable contains an integer, it will convert it to a float. If the variable contains a non-numeric value, it will return 0.
Examples:
echo floatval("235.567889") . "<br>"; // Output: 235.567889
echo floatval("235.567889Example") . "<br>"; // Output: 235.567889
echo floatval(35.56) . "<br>"; // Output: 35.56
echo floatval("Example123") . "<br>"; // Output: 0
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