String Format

ord() - Return ASCII value of character chr() - Return character by ASCII code

 
echo ord("A"); // 65
echo chr(65); // A

number_format() - is not locale-aware, and returns a rounded number

 
echo number_format("100000.698"); // 100,001 
echo number_format("100000.698", 3, ",", " "); // 100 000,698

str_pad() - Pad a string to a certain length with another string

     
echo str_pad("100", 6, "0"); // 100000
echo str_pad("333", 6, "0", STR_PAD_LEFT); // 000333

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