php中数组和字符串的相互转换 数组转字符串： implode('!', $arr);//将一维数组以！分隔组合成一个字符串，参数一可以为"" ~~~ $array = array('lastname', 'email', 'phone'); $comma_separated = implode(",", $array); echo $comma_separated; // lastname,email,phone // Empty string when using an empty array: var_dump(implode('hello', array())); // string(0) "" ~~~ 字符串转数组： explode('!', $str);//将字符串以!分割为一个一维数组,参数一不可以为"" ~~~ $pizza = "piece1 piece2 piece3 piece4 piece5 piece6"; $pieces = explode(" ", $pizza); echo $pieces[0]; // piece1 echo $pieces[1]; // piece2 // 示例 2 $data = "foo:*:1023:1000::/home/foo:/bin/sh"; list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data); echo $user; // foo echo $pass; // * ~~~ str_split($str, 3);//将字符串分割成数组，参数二将字符串从左向右每3个字符分割一次，最后的不够3个了 有几个算几个。 ~~~ <?php $str = "Hello Friend"; $arr1 = str_split($str); $arr2 = str_split($str, 3); print_r($arr1); print_r($arr2); ?> 输出结果 Array ( [0] => H [1] => e [2] => l [3] => l [4] => o [5] => [6] => F [7] => r [8] => i [9] => e [10] => n [11] => d ) Array ( [0] => Hel [1] => lo [2] => Fri [3] => end ) ~~~ 这里有一个将字符串进行打断的手动的方法，是原来为了写日语半角的假名验证的一个方法 ~~~ function kana_Perl($katakana){ $katakana_array = array( 1=>"ｱ",2=>"ｲ",3=>"ｳ",4=>"ｴ",5=>"ｵ", 6=>"ｶ",7=>"ｷ",8=>"ｸ",9=>"ｹ",10=>"ｺ", 11=>"ｻ",12=>"ｼ",13=>"ｽ",14=>"ｾ",15=>"ｿ", 16=>"ﾀ",17=>"ﾁ",18=>"ﾂ",19=>"ﾃ",20=>"ﾄ", 21=>"ﾅ",22=>"ﾆ",23=>"ﾇ",24=>"ﾈ",25=>"ﾉ", 26=>"ﾊ",27=>"ﾋ",28=>"ﾌ",29=>"ﾍ",30=>"ﾎ", 31=>"ﾏ",32=>"ﾐ",33=>"ﾑ",34=>"ﾒ",35=>"ﾓ", 36=>"ﾔ",37=>"ﾕ",38=>"ﾖ", 39=>"ﾗ",40=>"ﾘ",41=>"ﾙ",42=>"ﾚ",43=>"ﾛ", 44=>"ﾜ",45=>"ｦ",46=>"ﾝ", 47=>"ｧ",48=>"ｨ",49=>"ｩ",50=>"ｪ",51=>"ｫ", 52=>"ｬ",53=>"ｭ",54=>"ｮ",55=>"ｯ",56=>"､", 57=>"｡",58=>"ｰ",59=>"ﾞ",60=>"ﾟ" ); $check_result = array_search($katakana,$katakana_array); return $check_result; } ~~~ 这是一段匹配的法则，注意这里是i +=2,因为一个文字占2位 ~~~ function substr_cut($katakana){ $i_end = 2; $check_sucess = ""; for($i_start=0; $i_start < strlen($katakana); $i_start=$i_start+2){ $str_cut = substr($katakana,$i_start,$i_end); echo '$str_cut='.$str_cut.'<br>'; $check_sucess = kana_Perl($str_cut); if(!$check_sucess){ break; } } return $check_sucess; } ~~~ 没有规律的数组转化为字符串 ~~~ function substr_cut($katakana){ $i_end = 1; //打断位数长度，分清楚英文和中文 $check_sucess = array(); for($i_start=0; $i_start < strlen($katakana); $i_start=$i_start+1){ $str_cut = substr($katakana,$i_start,$i_end); $check_sucess[$i_start] = $str_cut; echo '$str_cut='.$str_cut.'<br>'; } return $check_sucess; } ~~~