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ctype_graph

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ctype_graph

(PHP 4 >= 4.0.4, PHP 5)

ctype_graphCheck for any printable character(s) except space

说明

bool ctype_graph ( string $text )

Checks if all of the characters in the provided string, text, creates visible output.

参数

text

The tested string.

返回值

Returns TRUE if every character in text is printable and actually creates visible output (no white space), FALSE otherwise.

范例

Example #1 A ctype_graph() example

<?php
$strings 
= array('string1' => "asdf "'string2' => 'arf12''string3' => 'LKA#@%.54');
foreach (
$strings as $name => $testcase) {
    if (
ctype_graph($testcase)) {
        echo 
"The string '$name' consists of all (visibly) printable characters. ";
    } else {
        echo 
"The string '$name' does not consist of all (visibly) printable characters. ";
    }
}
?>

以上例程会输出:

The string 'string1' does not consist of all (visibly) printable characters.
The string 'string2' consists of all (visibly) printable characters.
The string 'string3' consists of all (visibly) printable characters.

注释

Note:

If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.

参见

  • ctype_alnum() - Check for alphanumeric character(s)
  • ctype_print() - Check for printable character(s)
  • ctype_punct() - Check for any printable character which is not whitespace or an alphanumeric character

  • ctype_alnum
  • ctype_alpha
  • ctype_cntrl
  • ctype_digit
  • ctype_graph
  • ctype_lower
  • ctype_print
  • ctype_punct
  • ctype_space
  • ctype_upper
  • ctype_xdigit
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