The most straightforward way to get the ASCII value of a character in PHP is to use the ord() function, which returns the ASCII value of the first character of the string. 1. ord() receives a string parameter and returns only the ASCII value of the first character, such as ord('A') returns 65; 2. Be cautious when handling Chinese or special characters, because ord() only returns the first byte value of multi-byte characters, such as ord('In') returns 228; 3. Practical applications include judging character types and implementing simple encryption, such as judging whether it is a letter or number by comparing the ASCII range, or combining chr() to achieve Caesar's password displacement.
The most direct way to get the ASCII value of a character in PHP is to use the built-in function ord() . It receives a string parameter and returns the ASCII value of the first character.
1. Basic usage of ord() function
ord() is a very practical function when processing characters and ASCII conversions. Its syntax is simple:
int ord ( string $character )
The passed in is a character (or a string of multiple characters), but only the ASCII value of the first character will be taken.
example:
echo ord('A'); // Output 65 echo ord('a'); // Output 97 echo ord('0'); // Output 48
Note: If the passed in is a multi-character string, such as 'AB' , it still only processes the first character 'A' , and the result is still 65 .
2. Be careful when dealing with Chinese or special characters
Although ord() performs normally for English and numeric characters, there are problems when dealing with Chinese, emoji, or multi-byte characters. Because these characters usually take up multiple bytes, they are not a single ASCII character under UTF-8 encoding.
For example:
echo ord('in'); // The output may be 228, but this is just the value of the first byte, not the complete Unicode code point
If you need to deal with such characters, it is recommended to use mbstring extension or other multi-byte processing methods instead of using ord() directly.
3. Examples of practical application scenarios
Scene 1: Determine character type
You can use ord() to determine whether a character is a capital letter, lowercase letter or number:
$char = 'B';
$ascii = ord($char);
if ($ascii >= 65 && $ascii <= 90) {
echo "This is a capital letter";
} elseif ($ascii >= 97 && $ascii <= 122) {
echo "This is a lowercase letter";
} elseif ($ascii >= 48 && $ascii <= 57) {
echo "This is a number";
}Scenario 2: Implement simple character encryption/decryption
For example, the basic operation of Caesar's password can be used to implement character displacement using ord() and chr() :
function caesar($char, $shift) {
$code = ord($char);
return chr($code $shift);
}
echo caesar('A', 3); // Output D Basically that's it. ord() is simple and practical, but be aware that it can only handle single-byte characters. It is a very convenient gadget when doing character analysis, verification and conversion.
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