php - 在 PHP 中，如果数组中存在字符串，则添加 '-1'、'-2' 等，直到唯一

Question

在 PHP 中，我需要检查一个字符串是否存在于一个数组中。如果是，则应将“-1”添加到其值中，如果“string-1”再次存在，则应为“string-2”等，直到“string-N”是唯一的。

$string = 'string';
If $string exists in $array, $string = 'string-1'
If $string exists again in $array, $string = 'string-2'
If $string exists again in $array, $string = 'string-3'
etc

Answer 1

$filearray = //blah blah ... (you need to have this array filled before)
$filename = "string";
if (in_array($filename,$filearray))
{
    $i = 1;
    while (in_array($filename.'-'.$i,$filearray))
    {
        i++;
    }
    $filename = $filename.'-'.$i;
}
echo $filename;

Answer 2

这应该有效：

$array = array("this", "is", "my", "string", "and", "it", "is", "a", "string");
$string = "string";

$i = 1;
foreach ($array as &$value) {
    if ($value == $string) {
        $value = $string . "-" . ($i++);
    }
}
unset($value);

输出：

Array
(
    [0] => this
    [1] => is
    [2] => my
    [3] => string-1
    [4] => and
    [5] => it
    [6] => is
    [7] => a
    [8] => string-2
)

Answer 3

while循环的完美用例：

$tmp = $string;
$i = 1;
while(in_array($tmp, $array)) {
    $tmp = $string . '-' . $i;
    ++$i;
}
$string = $tmp;

例子：

$string = 'test';
$array = ['foo', 'bar', 'test', 'test-1'];

输出：

test-2

Answer 4

我假设您需要在数组中的每个字符串之后附加 -1, -2... 如果它不止一次出现。检查此代码：

<?php

$array = array("this", "is", "my", "string", "and", "it", "is", "a", "string", "do", "you", "like", "my", "string");
$ocurrences = array();

$iterator = new ArrayIterator($array);

while ($iterator->valid()) {
    $keys = array_keys($ocurrences);
    if (in_array($iterator->current(), $keys)) {
        $array[$iterator->key()] = $iterator->current() . '-' . $ocurrences[$iterator->current()];
        $ocurrences[$iterator->current()]++;
    }
    else {
        $ocurrences[$iterator->current()] = 1;
    }
    $iterator->next();
}

print_r($array);

它将打印：

Array
(
    [0] => this
    [1] => is
    [2] => my
    [3] => string
    [4] => and
    [5] => it
    [6] => is-1
    [7] => a
    [8] => string-1
    [9] => do
    [10] => you
    [11] => like
    [12] => my-1
    [13] => string-2
)