使用数组过滤列出echo的目录

This piece of code works:

<?php
header('Access-Control-Allow-Origin: *');
$imagesDir = '';
$images = glob($imagesDir . '*.{jpg,jpeg,png,gif}', GLOB_BRACE);
echo json_encode($images, JSON_UNESCAPED_UNICODE);
?>

I get correct echo of all jpg's in folder wich looks like this:

[
    "20180515_xxxxxxx.jpg",
    "20180517_yyyyyyy.jpg",
    "20180519_zzzzzzzz.jpg"
]

But I want to make certain filtering per date (only images wich name starts with date >= than today) because all jpg filenames begin with yyyymmdd in their name.

I am trying something like this:

<?php
header('Access-Control-Allow-Origin: *');
$imagesDir = '';
$images = glob($imagesDir . '*.{jpg,jpeg,png,gif}', GLOB_BRACE);

foreach($images as $image) {
    $current_date = date("Ymd");
    $file_date = substr($image, 0, 8);
    if (strcmp($current_date, $file_date)>=0)
    echo json_encode($image, JSON_UNESCAPED_UNICODE);
    }
?>

but I get echo like one huge name made of all images names. i just cant get echo in the same format. :(

You’re echoing out a JSON string for each image.

Instead of this:

foreach($images as $image) {
    $current_date = date("Ymd");
    $file_date = substr($image, 0, 8);
    if (strcmp($current_date, $file_date)>=0)
        echo json_encode($image, JSON_UNESCAPED_UNICODE);
}

Try adding an array and collecting them.

$filteredImages = [];
foreach($images as $image) {
    $current_date = date("Ymd");
    $file_date = substr($image, 0, 8);
    if (strcmp($current_date, $file_date)>=0)
        $filteredImages[] = $image
}
echo json_encode($filteredImages, JSON_UNESCAPED_UNICODE);

You could instead of using * in the filter, use today’s date as part of the file name to avoid having to loop through this.

You have an array and you want to filter that.

There's an inbuilt function called array_filter, that takes in an array and you can provide a callback function.

I furthermore recommend transforming the date into an actual DateTime object. Benefit is that you can compare DateTimes in if statements with all the compare operators:

<?php

function parseDate(string $date, $format = "Ymd")
{
    return DateTime::createFromFormat($format, $date)
        ->setTime(0, 0, 0);
}

$today = (new DateTime())->setTime(0, 0);
$filterCallback = function (string $file) use ($today): bool {
    $rawDate = explode("_", $file)[0]; // assumes all your date in the filename are followed up by at least one underscore
    $date = parseDate($rawDate);

    return $date >= $today;
};

$files = [
    "20180515_xxxxxxx.jpg",
    "20180517_yyyyyyy.jpg",
    "20180519_zzzzzzzz.jpg",
    "20250519_zzzzzzzz.jpg",
];

$filteredFiles = array_filter($files, $filterCallback);

foreach ($filteredFiles as $file) {
    echo "$file
";
}

Will output:

20180519_zzzzzzzz.jpg
20250519_zzzzzzzz.jpg