PHP如何将字符串拆分为较小的块

$string = "John Doe,123 Main Street,New York";
$parts = explode(",", $string);
// $parts 将包含 ["John Doe", "123 Main Street", "New York"]

$string = "John Doe;123 Main Street;New York";
$parts = preg_split("/;/", $string);
// $parts 将包含 ["John Doe", "123 Main Street", "New York"]

$string = "ABCDEFGHIJ";
$parts = str_split($string, 3);
// $parts 将包含 ["ABC", "DEF", "GHI", "J"]

$parts = ["John Doe", "123 Main Street", "New York"];
$string = implode(",", $parts);
// $string 将等于 "John Doe,123 Main Street,New York"

$string = "";
foreach ($parts as $part) {
$string .= $part . ",";
}
// $string 将等于 "John Doe,123 Main Street,New York,"

$string = "The quick brown fox jumps over the lazy dog.";
$parts = explode(" ", $string);
$parts[3] = "fast";
$newString = implode(" ", $parts);
// $newString 将等于 "The quick brown fast fox jumps over the lazy dog."

$url = "https://example.com/index.php?name=John&age=30";
parse_str(parse_url($url, PHP_URL_QUERY), $params);
// $params 将包含 ["name" => "John", "age" => "30"]

$file = fopen("data.csv", "r");
while (($line = fgetcsv($file)) !== false) {
// $line 将包含文件中的每一行作为一个数组
}