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PHP指定截取字符串中的中英文或数字字符的实例分享,
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PHP指定截取字符串中的中英文或数字字符的实例分享,

Jun 13, 2016 am 08:43 AM
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PHP指定截取字符串中的中英文或数字字符的实例分享,

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”
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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);  
} 
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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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