Php 如何在作用域外使用数组_Php

Php 如何在作用域外使用数组

php

Php 如何在作用域外使用数组,php,Php,当我将foreach循环置于for循环范围之外时，它似乎不起作用。我在这里做错了什么： <?php $allUrls = array(); for( $i = 0; $i <= 1; $i++ ) { $html = file_get_contents("http://www.keurmerk.info/Leden_Partners?s=&c=0&Page=".$i.""); $pattern = "/(http(s)?:\/\/)?(w{3}\

当我将foreach循环置于for循环范围之外时，它似乎不起作用。
我在这里做错了什么：

<?php
$allUrls = array();

for( $i = 0; $i <= 1; $i++ ) {

    $html = file_get_contents("http://www.keurmerk.info/Leden_Partners?s=&c=0&Page=".$i."");
    $pattern = "/(http(s)?:\/\/)?(w{3}\.)(\w+\.)([a-zA-Z]{2,6})(\/\w*)?/";
    preg_match_all( $pattern, $html, $urls );

    if ($i == 0) $allUrls[0] = $urls[0];
    else $allUrls[0] .= $urls[0];

}           

foreach ( $allUrls[0] as $url ) {
    echo $url . '<br>'; 
}
?>

如果我这样做：

<?php
for( $i = 0; $i <= 1; $i++ ) {

    $html = file_get_contents("http://www.keurmerk.info/Leden_Partners?s=&c=0&Page=".$i."");
    $pattern = "/(http(s)?:\/\/)?(w{3}\.)(\w+\.)([a-zA-Z]{2,6})(\/\w*)?/";
    preg_match_all( $pattern, $html, $urls );
    $allUrls[0] = $urls[0];
    foreach ( $allUrls[0] as $url ) {
        echo $url . '<br>';
    }
}
?>

然后它似乎起作用了。

改变这个：

$allUrls[0][] = $urls[0];

因此，整个代码将是：

$allUrls = array();

for( $i = 0; $i <= 1; $i++ ) {

    $html = file_get_contents("http://www.keurmerk.info/Leden_Partners?s=&c=0&Page=".$i."");
    $pattern = "/(http(s)?:\/\/)?(w{3}\.)(\w+\.)([a-zA-Z]{2,6})(\/\w*)?/";
    preg_match_all( $pattern, $html, $urls );

    $allUrls[$i] = $urls[0];

}           

foreach ( $allUrls as &$url ) {
    echo $url . '<br>'; 
}

$allUrls=array（）；
对于（$i=0；$i）
表示将该值附加到数组的第一个元素，这就像将字符串添加到值的末尾一样。如果需要向该数组（第0位的子数组）添加新值，请使用此表示法
$allUrls[0][] = $urls[0];

但是，实际上根本不需要这个子数组。您可以简单地删除它
if ($i == 0) $allUrls[0] = $urls[0];
else $allUrls[0] .= $urls[0];

和使用
 $allUrls[]=$urls[0];

然后像这样简单地在上面循环
foreach ( $allUrls as $url ) {
    echo $url . '<br>'; 
}

foreach（$allUrls作为$url）{
回显$url。“
”；
}
$allUrls=array（）；
对于（$i=0；$i您可以使用以下函数执行此操作：
function parseMyUrl($pageNo) {
    $html = file_get_contents("http://www.keurmerk.info/Leden_Partners?s=&c=0&Page=". $pageNo);
    $pattern = "/(http(s)?:\/\/)?(w{3}\.)(\w+\.)([a-zA-Z]{2,6})(\/\w*)?/";
    preg_match_all($pattern, $html, $urls);
    if ($urls[0])
        return $urls[0];
    else
        return array();
}

用法：
var_dump(parseMyUrl(1));
var_dump(parseMyUrl(2));

产出：
array (size=21)
  0 => string 'http://www.bikinisonline.eu' (length=27)
  1 => string 'http://www.handpoppen.net' (length=25)
  2 => string 'http://www.123kinderfietsen.nl' (length=30)
  3 => string 'http://www.123ledspots.nl' (length=25)
  4 => string 'http://www.123mijngordijn.nl' (length=28)
  5 => string 'http://www.123soatest.nl' (length=24)
  6 => string 'http://www.123sportfietsen.nl' (length=29)
  7 => string 'http://www.123superfoods.nl' (length=27)
  8 => string 'http://www.123telefoon.nl' (length=25)
  9 => string 'http://www.123tuinleds.nl' (length=25)
  10 => string 'http://www.123voetmassage.nl' (length=28)
  11 => string 'http://www.12cook.com' (length=21)
  12 => string 'http://www.1gameshop.be' (length=23)
  13 => string 'http://www.24parfums.nl' (length=23)
  14 => string 'http://www.2wielerwinkel.nl' (length=27)
  15 => string 'http://www.4activekidz.nl' (length=25)
  16 => string 'http://www.4kidsathome.nl' (length=25)
  17 => string 'http://www.4kidsnederland.nl' (length=28)
  18 => string 'http://www.4moregames.nl' (length=24)
  19 => string 'http://www.4sporters.nl' (length=23)
  20 => string 'https://www.extremetracking.com' (length=31)

array (size=19)
  0 => string 'http://www.goedkopesneeuwkettingen.nl' (length=37)
  1 => string 'http://www.bikinisonline.eu' (length=27)
  2 => string 'http://www.villatotaal.nl' (length=25)
  3 => string 'http://www.4yoursport.nl' (length=24)
  4 => string 'http://www.4youwear.nl' (length=22)
  5 => string 'http://www.6566.eu' (length=18)
  6 => string 'http://www.aadenwijn.nl' (length=23)
  7 => string 'http://www.aagifts.nl' (length=21)
  8 => string 'http://www.aanhangershop.nl' (length=27)
  9 => string 'http://www.aanhangwagendirect.nl' (length=32)
  10 => string 'http://www.aannemerskorting.nl' (length=30)
  11 => string 'http://www.abcoparts.nl' (length=23)
  12 => string 'http://www.aboutshoes.nl' (length=24)
  13 => string 'http://www.accudienst.nl/' (length=25)
  14 => string 'http://www.acculaptop.com' (length=25)
  15 => string 'http://www.accuserviceholland.nl' (length=32)
  16 => string 'http://www.accushop.nl' (length=22)
  17 => string 'http://www.accuweb.nl' (length=21)
  18 => string 'https://www.extremetracking.com' (length=31)

现在，如果你想在循环中使用它……你可以用一种漂亮干净的方式：
for ($i = 0; $i <= 1; $i++) {
    $urls = parseMyUrl($i);
    foreach ($urls as $url) {
        echo $url . '<br>';
    }
}

for（$i=0；$i）当您只将内容放在一个键中时，为什么要使用数组？在foreach之前打印$allUrls[0]，我想您会找到答案。如果不这样做，=
将连接字符串，而不会在数组中添加更多项。否则$allUrls[0]。=$url[0]
您对连接有何期望？preg_matchall生成数组。我收到以下通知：通知：数组到字符串的转换在第102行
这是foreach（$allUrls as$url）的这一行{
给出了错误。它不显示URL，我只在屏幕上看到错误。是的，可以在这里看到解决方案-或者在这里-只需执行打印（$allUrls）
然后你就会知道为什么会有这样的错误。我收到了以下通知：通知：数组到字符串的转换在第102行
这是这一行foreach（$allUrls as$url）{给出错误。在foreach循环中使用var_dump或print_r而不是echo..查看它是数组还是字符串..如果是字符串，则表示for循环中的$URL[0]是数组..var_一步一步地转储..我没有测试它..所以。。
array (size=21)
  0 => string 'http://www.bikinisonline.eu' (length=27)
  1 => string 'http://www.handpoppen.net' (length=25)
  2 => string 'http://www.123kinderfietsen.nl' (length=30)
  3 => string 'http://www.123ledspots.nl' (length=25)
  4 => string 'http://www.123mijngordijn.nl' (length=28)
  5 => string 'http://www.123soatest.nl' (length=24)
  6 => string 'http://www.123sportfietsen.nl' (length=29)
  7 => string 'http://www.123superfoods.nl' (length=27)
  8 => string 'http://www.123telefoon.nl' (length=25)
  9 => string 'http://www.123tuinleds.nl' (length=25)
  10 => string 'http://www.123voetmassage.nl' (length=28)
  11 => string 'http://www.12cook.com' (length=21)
  12 => string 'http://www.1gameshop.be' (length=23)
  13 => string 'http://www.24parfums.nl' (length=23)
  14 => string 'http://www.2wielerwinkel.nl' (length=27)
  15 => string 'http://www.4activekidz.nl' (length=25)
  16 => string 'http://www.4kidsathome.nl' (length=25)
  17 => string 'http://www.4kidsnederland.nl' (length=28)
  18 => string 'http://www.4moregames.nl' (length=24)
  19 => string 'http://www.4sporters.nl' (length=23)
  20 => string 'https://www.extremetracking.com' (length=31)

array (size=19)
  0 => string 'http://www.goedkopesneeuwkettingen.nl' (length=37)
  1 => string 'http://www.bikinisonline.eu' (length=27)
  2 => string 'http://www.villatotaal.nl' (length=25)
  3 => string 'http://www.4yoursport.nl' (length=24)
  4 => string 'http://www.4youwear.nl' (length=22)
  5 => string 'http://www.6566.eu' (length=18)
  6 => string 'http://www.aadenwijn.nl' (length=23)
  7 => string 'http://www.aagifts.nl' (length=21)
  8 => string 'http://www.aanhangershop.nl' (length=27)
  9 => string 'http://www.aanhangwagendirect.nl' (length=32)
  10 => string 'http://www.aannemerskorting.nl' (length=30)
  11 => string 'http://www.abcoparts.nl' (length=23)
  12 => string 'http://www.aboutshoes.nl' (length=24)
  13 => string 'http://www.accudienst.nl/' (length=25)
  14 => string 'http://www.acculaptop.com' (length=25)
  15 => string 'http://www.accuserviceholland.nl' (length=32)
  16 => string 'http://www.accushop.nl' (length=22)
  17 => string 'http://www.accuweb.nl' (length=21)
  18 => string 'https://www.extremetracking.com' (length=31)

for ($i = 0; $i <= 1; $i++) {
    $urls = parseMyUrl($i);
    foreach ($urls as $url) {
        echo $url . '<br>';
    }
}