How to add 0 to missing numbers in php

php method to implement missing numbers: first create a PHP sample file; then use the PHP function "str_pad()" function to fill the string with a new length. The statement is "str_pad(string,length, pad_string,pad_type)"; finally output the result.

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PHP generates 4 digits, add 0 in front if any is missing

Just a solution

You can use the PHP built-in function str_pad() function to fill the string to the new length.

str_pad(string,length,pad_string,pad_type)
//参数    描述
string      //必需。规定要填充的字符串。
length      //必需。规定新的字符串长度。如果该值小于字符串的原始长度，则不进行任何操作。
pad_string  //可选。规定供填充使用的字符串。默认是空白。
pad_type    //可选。规定填充字符串的哪边。
            //可能的值：
            STR_PAD_BOTH - //填充字符串的两侧。如果不是偶数，则右侧获得额外的填充。
            STR_PAD_LEFT - //填充字符串的左侧。
            STR_PAD_RIGHT - //填充字符串的右侧。默认。

Lift:

$num=128;
$num=str_pad($num,4,"0",STR_PAD_LEFT);   
echo $num;

Output:

0128

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