Highcharts时间数据兼容：整数型$time末尾加三个零的实现方法

Got it, let's solve this problem cleanly. The core issue here is that you want to convert your 10-digit second timestamp to a 13-digit millisecond timestamp (which is what Highcharts expects) without turning the value into a string.

The Right Approach: Multiplication Instead of String Concatenation #

Adding three zeros to the end of an integer is mathematically equivalent to multiplying it by 1000—and this operation preserves the integer type (as long as the result fits within your language's integer limits, which it will for timestamps).

Here's how to implement it in PHP:

// Your original integer timestamp
$time = 1346803200;

// Multiply by 1000 to get the millisecond timestamp, keeping it an integer
$millisecondTime = $time * 1000;

Why This Works #

• Unlike string concatenation (e.g., $time . '000'), multiplication maintains the integer data type. You can verify this with var_dump($millisecondTime)—it will show int(1346803200000) instead of a string.
• Timestamps in the 10-digit second format (like 1346803200) multiplied by 1000 will never exceed the maximum value of a 64-bit integer (which is 9223372036854775807), so you don't have to worry about overflow issues on modern systems.

Quick Verification #

If you want to double-check the type and value, run this snippet:

$time = 1346803200;
$millisecondTime = $time * 1000;

var_dump($millisecondTime);
// Output: int(1346803200000)

This will give you the exact integer value Highcharts needs for proper time rendering.

内容的提问来源于stack exchange，提问作者major697