php 循环写数组

<?php
$array = array();
for ($i = 0; $i < 5; $i++) {
    $array[] = "元素" . $i;
}
print_r($array);
?>

<?php
$associativeArray = array();
$keys = array("key1", "key2", "key3");
$values = array("值1", "值2", "值3");

foreach ($keys as $key => $value) {
    $associativeArray[$value] = $keys[$key];
}
print_r($associativeArray);
?>

<?php
$array = array();
for ($i = 0; $i < 5; $i++) { // 确保循环条件正确
    $array[] = "元素" . $i;
}
?>

<?php
$associativeArray = array();
$keys = array("key1", "key2", "key3");
$values = array("值1", "值2", "值3");

foreach ($keys as $key => $value) {
    if (!isset($associativeArray[$value])) { // 检查键是否存在
        $associativeArray[$value] = $keys[$key];
    }
}
print_r($associativeArray);
?>