(PHP 4 >= 4.0.4, PHP 5)
ctype_print — Check for printable character(s)
$text
)
Checks if all of the characters in the provided string,
text, are printable.
text
The tested string.
Returns TRUE if every character in text
will actually create output (including blanks). Returns FALSE if
text contains control characters or characters
that do not have any output or control function at all.
Example #1 A ctype_print() example
<?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.