PHP数组与字符串互相转换实例

<?php
 
$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) ""
 
?>

<?php
// 示例 1
$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; // *

?>

<?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
)

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;
  }

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;
}

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;
}