PHP chr()函数用法介绍 _PHP

【PHP chr()函数用法介绍】chr()function是PHP中的内置函数, 用于将ASCII值转换为字符。它接受ASCII值作为参数, 并返回表示来自指定ASCII值的字符的字符串。 ASCII值可以十进制, 八进制或十六进制值指定。

八进制值由前导0定义。
十六进制值由前导0x定义。

的ASCII码值表可以参考这里。
语法:

string chr( $asciiVal)

参数：此函数接受单个参数$ asciiVal。此参数包含有效的ASCII值。 chr()函数返回我们传递给它的ASCII值的相应字符作为参数$ asciiVal。
返回值：该函数返回我们传递其ASCII值的字符。
例子：

Input :ASCII=35 ASCII=043 ASCII=0x23 Output : # # # Explanation: The decimal, octal and hex value of '#' is 35, 043 and 0x23 respectivelyInput : ASCII=48 Output : 0

下面的程序说明了PHP中的chr()函数：
程序1：传递不同的ASCII但等效字符相同时, 演示chr()函数的程序。

< ?php // PHP program to demonstrate the chr() function$n1 = 35; $n2 = 043; $n3 = 0x23; echo "The equivalent character for ASCII 35 in decimal is " ; echo chr ( $n1 ), "\n" ; // Decimal valueecho "The equivalent character for ASCII 043 in octal is " ; echo chr ( $n2 ), "\n" ; // Octal valueecho "The equivalent character for ASCII 0x23 in hex is " ; echo chr ( $n3 ); // Hex value?>

输出如下：

The equivalent character for ASCII 35 in decimal is # The equivalent character for ASCII 043 in octal is # The equivalent character for ASCII 0x23 in hex is #

程式2：程序演示使用数组的chr()函数。

< ?php // PHP program to demonstrate the chr() function // in array $a =[48, 49, 50]; foreach ( $a as $i ) { echo "The character equivalent of ASCII value of ", $i, " is "; echo chr ( $i ), "\n" ; }?>

输出如下：

The character equivalent of ASCII value of 48 is 0 The character equivalent of ASCII value of 49 is 1 The character equivalent of ASCII value of 50 is 2