PHP:如何测试字符串开头和结尾的空格 - PHP: How do I test for whitespace at the beginning and end of a string?

PHP: How do I test for whitespace at the beginning and end of a string?

如何测试字符串开头和结尾的空格？

我

不想删除空格，我只想返回一个布尔TRUE或FALSE如果它们存在。

谢谢。

$string = <your string>;
$ns_string = trim($string);
$spaces_present = ($ns_string == $string) ? false : true;

用较短的符号

$space_present = ($string != trim($string));

这应该适合您：

<?php
    $str = "test";
    if($str[0] == " "|| $str[strlen($str)-1] == " ")
        echo "space at the start or the end";
?>

ctype_space($str[0]) || ctype_space(substr($str, -1))

<?php
$test = 'test ';
if (strpos($test, ' ') === 0 || strpos($test, ' ') === strlen($test)-1) {
    return true;
}
?>

编辑：见黑蜂解释

像这样检查

  if (substr($str, -1) == " " || $str[0] == " " ) {
    }

简单的正则表达式

preg_match("~(^'s|'s$)~", $subject);