hypothetical
$a = 1;
$b = 10;
suppose that $an is only one digit, then add 0 before it, and change 01
$b has ten digits, so do not add
this can be reached by what function?
hypothetical
$a = 1;
$b = 10;
suppose that $an is only one digit, then add 0 before it, and change 01
$b has ten digits, so do not add
this can be reached by what function?
str_pad($a,2,"0",STR_PAD_LEFT)you can write a function yourself, using the knowledge of concatenating strings
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