How to add 0 if the php string is insufficient

In PHP, you can use the str_pad() function to pad the string with 0s. This function can fill a string with specified characters to a specified length. You only need to set the third parameter to "0" to fill in the missing length with 0. The syntax is "str_pad(string, specified length, '0', type )"; the parameter "type" specifies the padding direction. The value "STR_PAD_BOTH" is filled on both sides, the value "STR_PAD_LEFT" is filled with the left side, and the value "STR_PAD_RIGHT" is filled with the right side.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use str_pad The () function realizes filling in 0 if the string is missing.

str_pad() function can fill the string to a new length, that is, fill the string to the specified length with the specified characters.

str_pad(string,length,pad_string,pad_type)

You only need to set the third parameter pad_string to "0" to fill in the missing length with 0.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="123456";
echo "原字符串：".$str."<br><br>";

echo "补位后：".str_pad($str,10,"0")."<br><br>";
echo "补位后：".str_pad($str,10,"0",STR_PAD_BOTH)."<br><br>";
echo "补位后：".str_pad($str,10,"0",STR_PAD_LEFT)."<br><br>";
?>

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