Php回声来自Json的最高数字

Question

I'm searching an external Json page, for $a and echoing $b.

<?php
$jsonurl = "site.com/json.json";
$json = file_get_contents($jsonurl);
$json_output = json_decode($json);

foreach ($json_output as $page) {
    foreach($page->X as $X) {
        if (isset($X->a)) {
            $a= $x->a;
            $b  = $x->b;
    if ( $a == 'Hello' || $a == 'Hi'){
    echo $b

$b is a number, and there could be only one number or perhaps two or three. If there's more than one, what is a tidy way of only echoing the largest value of $b rather than all of them should more than one value exist?

The numbers are unknown so I can't use echo max or something similar.

Answer 1

$number = array();
foreach ($json_output as $page) {
    foreach($page->X as $X) {
        if (isset($X->a)) {
            $a= $x->a;
            $b  = $x->b;
            if ( $a == 'Hello' || $a == 'Hi'){
                $numbers[] = $b;
            }
        }
    }
}
echo max($numbers);

See php.net