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Php character an into a number of methods: 1, the use of boolval () function, syntax "boolval ('a')", the character a can be converted into a number of 2, use ord () function, syntax "ord ('a')", will return the character an in the form of integers ASCII value, that is, the character an into the number 97.

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

Php converts the character a to a number

1. Use the boolval () function

The boolval () function converts a variable to a Boolean type, which has only two values, true (corresponding to the number 1) and false (corresponding to the number 0).

2. Use the ord () function

The ord () function returns the ASCII value of the first character in the string, or the ASCII value of a single character.

The return value is the ASCII value as an integer.

Description:

ASCII ((American Standard Code for Information Interchange): American Standard Code for Information Interchange) is a computer coding system based on the Latin alphabet, mainly used to display modern English and other Western European languages. It is the most general information exchange standard and is equivalent to the international standard ISO/IEC 646. ASCII was first published as a specification standard in 1967 and last updated in 1986, with a total of 128 characters defined so far.

Control characters: LF (line feed), CR (carriage return), FF (page feed), DEL (delete), BS (backspace), BEL (ring), etc.; communication characters: SOH (header), EOT (tail), ACK (confirmation), etc.; ASCII values of 8, 9, 10 and 13 are converted to backspace, tabulation, line feed and carriage return characters, respectively. They do not have a specific graphical display, but will have different effects on text display depending on different applications.

32 '126 (95 total) are characters (32 are spaces), of which 48' 57 is 0 to 9 ten Arabic numerals.

65'90 is 26 capital letters, 97 '122 is 26 lowercase letters, and the rest are punctuation marks, arithmetic symbols and so on.

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