PHP指定截取字符串中的中英文或数字字符的实例分享_php实例
我们在开发过程中,经常会碰到截取中文英文数字等的问题,大家知道中文所占的字符和英文数字是不同的;然后我们就会在项目的common里写一些日常的函数包含时间计算转换和中英文字符截取的函数;比如截取中英文的函数没个几行代码恐怕拿不下来的吧,现在就告诉大家一个简单的(自己本地运行过的),如有问题,请大家多多指教
$c = 'ddaabbccaa'; $d = '地球需要我们每个人的爱护'; $frist1 = mb_substr( $c, 0, 1 ,"UTF-8"); // d $delete_last1 = mb_substr($d, -1,1,"UTF-8"); // 护 echo $frist1.'+++'.$delete_last1.'<br/>'; // d+++护 $frist2 = mb_substr( $d, 0, 1 ,"UTF-8"); // 地 $delete_last2 = mb_substr($d, -1,1,"UTF-8"); // 护 echo $frist2.'+++'.$delete_last2.'<br/>'; // 地+++护 $e = '11aa22cc33'; $f = 'aa地球需要我们每个人的爱护'; $g = '地球需要我们每个人的爱护gg'; $h = '地球需要我们每个人的爱护'; $first3 = mb_substr( $e, 0, 1 ,"UTF-8"); // 1 $last3 = mb_substr( $f, 0, 1 ,"UTF-8"); // a $delete_last3 = mb_substr($f, -1,1,"UTF-8"); // 护 $delete_last4 = mb_substr($g, -1,1,"UTF-8"); // g $frist4 = mb_substr( $g, 0, 1 ,"UTF-8"); // 地 $delete_last5 = mb_substr($h, -1,1,"UTF-8"); // 护 echo $first3.'+++'.$last3.'---'.$delete_last3.'***'.$delete_last4.'&&&'.$frist4.'<br/>'; // 1+++a---护***g&&&地 echo $last3.'...'.$delete_last3.'<br/>'; // a...护 echo $frist4.'...'.$delete_last5.'<br/>'; // 地...护 // 这样不管字符串里是中英文数字等都是可以的无需判断,如: ”地...护“ 或者 “地...” 或者 “...护”
PS:过滤字符串中空格的方法
去除字符串首尾中英文空格的方法:
function mbTrim($str) { return mb_ereg_replace('(^( | )+|( | )+$)', '', $str); }
下面的正则验证时过滤掉用户输入的连续空格,包括全角空格和半角空格
$user = mb_ereg_replace('^( | )+', '', $user); $user = mb_ereg_replace('( | )+$', '', $user); $age = mb_ereg_replace('^( | )+', '', $age); $age = mb_ereg_replace('( | )+$', '', $age); $method = mb_ereg_replace('^( | )+', '', $method); $method = mb_ereg_replace('( | )+$', '', $method); $address = mb_ereg_replace('^( | )+', '', $address); $address = mb_ereg_replace('( | )+$', '', $address);

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