Summarize several ways to convert strings to numeric types in PHP

In PHP, strings and numbers are two different data types. String type data is composed of a series of characters, while numeric type data is composed of numeric characters, but it can directly perform mathematical operations. Sometimes, when we need to convert a string type data into numeric type data, we need to use the conversion function provided by PHP.

The following are several ways to convert strings to numeric types in PHP:

1. Use the intval() function:

The intval() function is In PHP, function to convert string to integer. It can convert a string type data into integer type data. When the converted string contains non-numeric characters, the intval() function will extract the previous numeric part of the string and convert it into a number and return it.

Sample code:

$str = '12345';
$num = intval($str);
echo $num; // 输出：12345

In the above example, $str is string type data. After being converted by the intval() function, it becomes numeric type data.

2. Use the floatval() function

If you need to convert string type data into floating-point numeric type data, we can use the floatval() function. It can convert a string type data into floating point numeric type data.

Sample code:

$str = '123.45';
$num = floatval($str);
echo $num; // 输出：123.45

In the above example, $str is string type data. After being converted by the floatval() function, it becomes floating point numeric type data.

3. Using forced type conversion

You can use forced type conversion in PHP to convert a string type data into numeric type data. When we need to convert a string to an integer type of data, we can use the (int) keyword for forced type conversion. When we need to convert a string to floating-point numeric data, we can use the (float) keyword to perform cast conversion.

Sample code:

$str1 = '12345';
$num1 = (int)$str1;
echo $num1; // 输出：12345

$str2 = '123.45';
$num2 = (float)$str2;
echo $num2; // 输出：123.45

In the above example, $str1 and $str2 are string type data. After forced type conversion, $num1 becomes an integer type. Data, $num2 becomes floating point numeric type data.

Summary:

The above is the method of converting string type data into numeric type data in PHP. We can choose different ways to achieve conversion according to our own needs. It should be noted that when performing forced type conversion, if the string contains non-numeric characters, the conversion result may have a certain degree of error. Therefore, when performing type conversion, we must handle it based on the specific situation.

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