How to convert character a into number in php

php method to convert the character a into a number: 1. Use the boolval() function, the syntax "boolval('a')" can convert the character a into the number 1; 2. Use the ord() function , the syntax "ord('a')" will return the ASCII value of character a in integer form, that is, convert character a into the number 97.

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

php will change the character a Convert to a number

1. Use the boolval() function

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

<?php 
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;a&#39;;
echo boolval($str);
?>

2. Use the ord() function

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;a&#39;;
echo ord($str);
?>

• 0~31 and 127 (33 in total) are control characters or communication-specific characters (the rest are displayable characters), such as control characters: LF (line feed), CR (carriage return) ), FF (page feed), DEL (delete), BS (backspace), BEL (ring), etc.; communication special characters: SOH (head of text), EOT (end of text), ACK (confirmation), etc.; ASCII value 8, 9, 10 and 13 are converted to backspace, tab, line feed and carriage return characters respectively. They do not have a specific graphic display, but will have different effects on text display depending on different applications [1] .

• 32~126 (95 in total) are characters (32 is a space), of which 48~57 are ten Arabic numerals from 0 to 9.

• 65~90 are 26 uppercase English letters, 97~122 are 26 lowercase English letters, and the rest are some punctuation marks, arithmetic symbols, etc.

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