I have a field with a limit of 4 characters where I will enter a value, I would like the remaining space to be completed with zeros from left to right, for example, if the user enters the number 4. I would have to leave 0004 if I inserted 100 , would have to quit 0100, if 1000 was inserted, would quit 1000, and so on.
How can I do this with PHP?
Use the str_pad function in conjunction with the STR_PAD_LEFT flag.
echo str_pad('5' , 4 , '0' , STR_PAD_LEFT);
Output:
0005
Or with 100:
echo str_pad('100' , 4 , '0' , STR_PAD_LEFT);
Output:
0100
Use str_pad() function to add the leading zeros and pass the fourth argument as STR_PAD_LEFT .
echo str_pad(1, 4, 0, STR_PAD_LEFT);
echo str_pad(10, 4, 0, STR_PAD_LEFT);
echo str_pad(100, 4, 0, STR_PAD_LEFT);
echo str_pad(1000, 4, 0, STR_PAD_LEFT);
Output:
0001
0010
0100
1000
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