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Zero Padded Numbers with php?

Today I got a situation where I need automatically zero filled number. I realized it could be done much str_pad. The reason I am writing this post is, I just want to share with my readers.

str_pad — Pad a string to a certain length with another string. String pad is used to make a given string larger by N number of characters by adding specified string for padding , default is white space.

str_pad ( string $input, int $pad_length [, string $pad_string = " "[, int $pad_type = STR_PAD_RIGHT ]] )


Following are the notes –

  • If pad_type is not specified it is assumed to be STR_PAD_RIGHT.
  • If not an even number, the right side gets the extra padding.
  • If the optional argument pad_string is not supplied, the input is padded with spaces
  • Specifies the pad_string length. If this value is less than the original length of the string, nothing will be happened.

Examples :

    $string = "hello php"; // string lenth is 12 so pad_string value must be pad_string > 12
    echo str_pad($string, 12,'a'); // outPut : hello phpaaa
    echo str_pad($string, 12,'a', STR_PAD_LEFT); // outPut : aaahello php
    echo str_pad($string, 12,'a', STR_PAD_RIGHT); // outPut : hello phpaaa
    echo str_pad($string, 13,'a', STR_PAD_BOTH); // outPut : aahello phpaa 
    // NOTE : If not an even number, the right side gets the extra padding

Simple Function to get Zero Padded Numbers

function getZeroPaddedNumber($value, $padding, ,$pad_type = STR_PAD_LEFT) {
       return str_pad($value, $padding, "0", STR_PAD_LEFT);

 echo getZeroPaddedNumber(123, 4);
// outputs "0123"
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