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Today, I would like to share with you how php carries out the conversion between numbers and letters. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Numbers and letters for mutual conversion methods: 1, the use of chr () function, the specified number can be converted into letters, syntax "chr (number)", will be in the form of integer ASCII value into the specified letter; 2, the use of ord () function, the specified letter can be converted into numbers, syntax "ord (letter)", will return the integer form of ASCII value.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php can convert numbers and letters to each other through the following two functions:

Chr () function

Ord () function

1. Use the chr () function to convert the specified number into letters

The chr () function returns characters from the specified ASCII value.

ASCII is a computer coding system based on the Latin alphabet that uses a specified combination of 7-bit or 8-bit binary numbers to represent 128 or 256 possible characters. Where:

65'90 means: 26 capital letters

9700122 means: 26 lowercase letters

Example:

2. Use the ord () function to convert a specified letter into a number.

The ord () function returns the ASCII value of the specified character and returns the ASCII value as an integer.

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