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ctype_space

ctype_space

(PHP 4 >= 4.0.4, PHP 5)

ctype_spaceCheck for whitespace character(s)

说明

bool ctype_space ( string $text )

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

参数

text

The tested string.

返回值

Returns TRUE if every character in text creates some sort of white space, FALSE otherwise. Besides the blank character this also includes tab, vertical tab, line feed, carriage return and form feed characters.

范例

Example #1 A ctype_space() example

<?php
$strings 
= array('string1' => " "'string2' => " arf12"'string3' => ' ');
foreach (
$strings as $name => $testcase) {
    if (
ctype_space($testcase)) {
        echo 
"The string '$name' consists of all whitespace characters. ";
    } else {
        echo 
"The string '$name' does not consist of all whitespace characters. ";
    }
}
?>

以上例程会输出:

The string 'string1' consists of all whitespace characters.
The string 'string2' does not consist of all whitespace characters.
The string 'string3' does not consist of all whitespace 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_cntrl() - Check for control character(s)
  • ctype_graph() - Check for any printable character(s) except space
  • 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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