PHP string array to number type conversion

In PHP, conversion between string arrays and numeric types is a very common operation. Especially when processing form data, database operations and other functions, you will inevitably encounter this problem. Here's how to convert a string array to a numeric type.

First of all, we need to understand the characteristics of string arrays in PHP. A string array is an array type composed of multiple string elements, as shown below:

$array = array("1", "2", "3");

In this array, each element is of string type, not numeric type. If we want to convert each element in this array to a numeric type, we can use the intval() function in PHP or cast.

1. Use the intval() function for conversion:

The intval() function can convert a string to a numeric type. We only need to iterate through each element in the array and pass it as a parameter to the intval() function to achieve type conversion.

$array = array("1", "2", "3");

for($i=0; $i
In the above code, we traverse each element in the array through a for loop and pass it as a parameter to the intval() function. The return value of the function is an integer type, and the data type of the element is converted to a numeric type. 
2. Convert using forced type conversion: 
Another conversion method is to directly use forced type conversion to convert the string type to a numeric type. In PHP, you can convert variable data type to integer or floating point type using keywords like (int) or (float). In this case, we can use the (int) keyword for type conversion. 
$array = array("1", "2", "3");

for($i=0; $i
In the above code, we use (int) keyword to convert string type to integer type. Likewise, this method converts each element in the array to a numeric type. 
Summary: 
Whether you use the intval() function or forced type conversion, you can convert a string array into a numeric type array. In general, using intval() is more efficient, so when the amount of data is large, it is recommended to use the intval() function for type conversion. 
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