在PHP中,我们知道我们可以使用函数str_shuffle()
随机调整字符串字符。因此,字符串"developer"
每次都会变为"lrevdeope", "dvolpeere"
等等。
但这不是我想要的。相反,我想随机改组辅音。因此,"developer"
应在每次刷新页面时变为"verelodep", "leveroped"
等。
我们怎样才能实现它?有什么想法吗?
答案 0 :(得分:3)
几分钟后,我有了这个:
$s = 'developer';
$cons = [];
for ($i = 0; $i < strlen($s); $i++) {
if (!in_array($s[$i], ['a', 'e', 'i', 'o', 'u', 'y'])) {
$cons[] = $s[$i];
$s[$i] = '-';
}
}
shuffle($cons);
for ($i = 0; $i < strlen($s); $i++) {
if ($s[$i] == '-') {
$s[$i] = array_shift($cons);
}
}
echo $s . PHP_EOL;
答案 1 :(得分:0)
您可以像这样创建自定义函数:
function shuffle_consonants($str) {
$str = str_split($str);
$vowels = ['a','e','i','o','u'];
foreach($str as $char)
if(!in_array($char, $vowels)) $con .= $char;
$con = str_shuffle($con);
$idx = 0;
foreach($str as &$char)
if(!in_array($char, $vowels)) $char = $con[$idx++];
return implode("", $str);
}
echo shuffle_consonants("developer");
答案 2 :(得分:0)
这里有一个替代方案:
$word = "developer";
$letters = str_split($word);
$consonants = array_filter($letters, function ($letter) {
return !in_array($letter, ['a', 'e', 'i', 'o', 'u', 'y']);
}); //Get all consonants with their index
$consonantPositions = array_keys($consonants); //keep indexes (shuffle will lose them)
shuffle($consonants);
$letters = array_combine($consonantPositions, $consonants) + $letters; // put the shuffled consonants in their indexes and glue them back into the letters
ksort($letters); // put the keys back in their place
echo implode("",$letters);
答案 3 :(得分:0)
我很欣赏u_mulder方法的总体设计,但我想为可能感兴趣的读者做一些改进/微观优化。
strlen()
值,以便php不必重复生成它。致电strpos()
以区分元音与辅音。 (参考:in_array vs strpos for performance in php)
不要使用-
临时替换输入字符串中的辅音。
代码:(Demo)
$string="developer";
$consonants=[];
$length=strlen($string);
for($offset=0; $offset<$length; ++$offset){ // iterate each letter of the string ... OR for($offset=strlen($string); --$offset;){
if(strpos('aeiou',$string[$offset])===false){ // isolate the consonants
$consonants[]=$string[$offset]; // store the consonant
$offsets[]=$offset; // store the offset (aka indexed position of the consonant in the string)
}
}
shuffle($consonants); // shuffle the array of stored consonants
foreach($consonants as $index=>$consonant){ // iterate ONLY the stored consonants
$string[$offsets[$index]]=$consonant; // reassign the consonants in their new positions
}
echo $string; // possible output: revepoled
这里有一个数组函数和foreach循环的混合,可以重新插入混洗的辅音:
$string="developer";
$consonants=array_diff(str_split($string),['a', 'e', 'i', 'o', 'u']); // isolate consonants, preserve offsets as keys
$offsets=array_keys($consonants); // store copy of offsets before shuffling
shuffle($consonants); // shuffle the array of stored consonants (returned value is re-indexed)
foreach($consonants as $i=>$consonant){
$string[$offsets[$i]]=$consonant; // reassign the shuffled consonants at the known consonant positions
}
echo $string;
对于任何认为我没有提供任何独立想法的人......这是另一种方法,它将实现两个字符串函数调用,然后是正则表达式函数调用(这将对速度产生负面影响,但不会非常可怕)这可能写成一个双线。
代码:(Demo)
$word="developer";
$shuffled_consonants=str_shuffle(str_replace(['a','e','i','o','u'],'',$word)); // generate shuffled string of consonants
// reinsert shuffled consonants at original consonant positions
echo preg_replace_callback(
'~[^aeiou]~', // match each consonant at original position
function($m)use($shuffled_consonants){ // pass in the shuffled string
static $offset=0; // init the offset counter
return $shuffled_consonants[$offset++]; // insert new consonant at original position using post-incrementation
},
$word);