在字符串之间获取字符串并在PHP中循环内容

Question

The function below fetches only the first occurrence. In this case it returns: "John Smith [e-mail]", how do I get the other names with their corresponding Emails.

I appreciate your help.

<?php
function get_string_between($string, $start, $end)
{

    $string = " ".$string;
    $ini = strpos($string,$start);
    if ($ini == 0) return "";
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) - $ini;
    return substr($string,$ini,$len);
}

////////////// CONTENT TO BE PARSED ///////////////////
$fullstring = 'Name: John Smith<br> Email: [e-mail]<br> Name: Perter Doe<br>Email: [e-mail]<br> Name: Nelly Denver<br> Email: [e-mail]<br>'; 

///////////////////////////////////

$parsed1 = get_string_between($fullstring, "Name:", "<br>");
$parsed2 = get_string_between($fullstring, "Email: ", "<br>");

$parsed = $parsed1.'<br>'.$parsed2.'<br>';

echo $parsed;

?>

Answer 1

strpos() can only find the numeric position of the first occurrence and hence your function can't be used to find multiple occurences. You could use a regex with preg_match_all() to do this:

function get_string_between($string, $start, $end) {
    $start = preg_quote($start);
    $end = preg_quote($end);
    $pattern = "~$start\s*(.*?)$end\s*~";
    $match = preg_match_all($pattern, $string, $matches);
    if ($match) {
        return $matches[1];
    }
}

Usage:

$parsed1 = get_string_between($fullstring, 'Name:', '<br>');
print_r($parsed1);

$parsed2 = get_string_between($fullstring, 'Email:', '<br>');
print_r($parsed2);

Output:

Array
(
    [0] => John Smith
    [1] => Perter Doe
    [2] => Nelly Denver
)
Array
(
    [0] => [e-mail]
    [1] => [e-mail]
    [2] => [e-mail]
)

Now, to print the names and emails, you can simply loop through the result arrays, like so:

$parsed1 = get_string_between($fullstring, 'Name:', '<br>');
$parsed2 = get_string_between($fullstring, 'Email:', '<br>');

for ($i=0; $i < count($parsed1); $i++) { 
    echo $parsed1[$i] . ' ' . $parsed2[$i] . '<br/>';
}

Output:

John Smith [e-mail]
Perter Doe [e-mail]
Nelly Denver [e-mail]

Demo.