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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_print — 做可打印字符检测
$text
)
检查提供的 string 和 text
里面的字符是不是都是可以打印出来。
text
需要被测试的字符串。
如果在当前的语言环境下 text
里面的每个字符都能被实际输出(包括空白),就返回 TRUE
;如果 text
里面包含控制字符或者那些根本不会有任何输出的字符串,就返回 FALSE
。
Example #1 一个 ctype_print() 例子
<?php
$strings = array( 'string1' => "asdf\n\r\t" , 'string2' => 'arf12' , 'string3' => 'LKA#@%.54' );
foreach ( $strings as $name => $testcase ) {
if ( ctype_print ( $testcase )) {
echo "The string ' $name ' consists of all printable characters.\n" ;
} else {
echo "The string ' $name ' does not consist of all printable characters.\n" ;
}
}
?>
以上例程会输出:
The string 'string1' does not consist of all printable characters. The string 'string2' consists of all printable characters. The string 'string3' consists of all printable characters.
Note:
如果给出一个 -128 到 255 之间(含)的整数, 将会被解释为该值对应的ASCII字符 (负值将加上 256 以支持扩展ASCII字符). 其它整数将会被解释为该值对应的十进制字符串.
[#1] Anonymous [2012-06-12 17:59:41]
Only ascii 32 thru 126 (inclusive) are considered printable. Tab (ascii 7), carriage return (ascii 13), linefeed (ascii 10) etc may produce output but are not considered printable.