Conversion and formatted output of variable types in PHP

Conversion and formatted output of variable types in PHP

In PHP, variable types can be converted to each other, which is useful for processing data and output results very useful. At the same time, formatted output can make the data more readable and meet specific display needs.

1. Variable type conversion

1. String to integer
   String to integer can be converted using forced type conversion or built-in functions.

Code example:

$str = "123";
$int1 = (int)$str; // 使用强制类型转换
$int2 = intval($str); // 使用intval()函数

echo $int1; // 输出 123
echo $int2; // 输出 123

2. Convert integer to string
   Convert integer to string using forced type conversion or built-in function.

Code example:

$int = 123;
$str1 = (string)$int; // 使用强制类型转换
$str2 = strval($int); // 使用strval()函数

echo $str1; // 输出 "123"
echo $str2; // 输出 "123"

3. String to floating point number
   String to floating point number can be converted using forced type conversion or built-in functions.

Code example:

$str = "3.14";
$float1 = (float)$str; // 使用强制类型转换
$float2 = floatval($str); // 使用floatval()函数

echo $float1; // 输出 3.14
echo $float2; // 输出 3.14

4. Floating point number to string
   Floating point number to string can be converted using forced type conversion or built-in functions.

Code example:

$float = 3.14;
$str1 = (string)$float; // 使用强制类型转换
$str2 = strval($float); // 使用strval()函数

echo $str1; // 输出 "3.14"
echo $str2; // 输出 "3.14"

5. Array to string
   Array to string You can use the implode() function to concatenate the array elements into a string.

Code example:

$arr = array('Hello', 'World');
$str = implode(' ', $arr);

echo $str; // 输出 "Hello World"

2. Formatted output

1. Number formatted output
   You can use the number_format() function for digital formatted output .

Code example:

$num = 1234.56;
$format_num = number_format($num);

echo $format_num; // 输出 "1,234.56"

2. Date formatted output
   Date formatted output can use the date() function.

Code example:

$date = date('Y-m-d H:i:s');
echo $date; // 输出当前的日期和时间，例如 "2022-01-01 10:00:00"

3. Thousands separator
   Thousands separator can use the number_format() function.

Code example:

$num = 1234567;
$format_num = number_format($num);

echo $format_num; // 输出 "1,234,567"

4. Currency formatted output
   Currency formatted output can use the money_format() function.

Code sample:

$money = 1234.56;
$format_money = money_format('%.2n', $money);

echo $format_money; // 输出 "1,234.56"

Summary:

Conversion and formatted output of variable types in PHP can help developers process data and output results. Conversion between different types can be easily achieved through casts and built-in functions. At the same time, reasonable formatted output can make the data more beautiful and easy to read, and meet different display needs. The above is a brief introduction and code examples of variable type conversion and formatted output in PHP. I hope it will be helpful to your study and work.

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