Question

我正在开发一个脚本，每次运行时都会将文件列表保存到文件中。

每次脚本运行时，都应该检查文件，如果文件中没有包含网址，则应将该网址发布到Facebook。如果网址已经在文件中，则不应将其发布到Facebook。

现在，每次脚本运行时，即使已经在文件中，也会将一个网址发布到Facebook。不确定我做错了什么：

<?php

define('FACEBOOK_SDK_V4_SRC_DIR', __DIR__.'/src/Facebook/');
require_once(__DIR__.'/src/Facebook/autoload.php');

require('simple_html_dom.php');

$fb = new Facebook\Facebook([
 'app_id' => 'xxxxxxxx',
 'app_secret' => 'xxxxxxxx',
 'default_graph_version' => 'v2.8',
]);



$html = file_get_html('https://www.trulia.com/for_sale/McKinney,TX/300000p_price/SINGLE-FAMILY_HOME_type/date;d_sort/');

$houses = [];

$i = 1;

foreach ($html->find('.cardContainer') as $house) {
    if ($i > 2) {
        break;
    }

    $houseLink = $house->find('a.tileLink', 0);

    $houseUrl = 'https://trulia.com' . $houseLink->href;

    file_put_contents("houses.txt", ($houseUrl . "\n"), FILE_APPEND);

    $singleHouseHtml = file_get_html("{$houseUrl}");

    $singleHouseHtmlDesc = $singleHouseHtml->find('span#corepropertydescription', 0);

    $singleHouseHtmlDescText = $singleHouseHtmlDesc->plaintext;

    $houseFile = file_get_contents("houses.txt");

    if(strpos($houseFile, $houseUrl) == false) {
        $linkData = [
            'link' => $houseUrl,
            'message' => $singleHouseHtmlDescText
        ];
        $pageAccessToken ='xxxxxxxxx';

        try {
            $response = $fb->post('/me/feed', $linkData, $pageAccessToken);
        } catch(Facebook\Exceptions\FacebookResponseException $e) {
            echo 'Graph returned an error: '.$e->getMessage();
        exit;
        } catch(Facebook\Exceptions\FacebookSDKException $e) {
            echo 'Facebook SDK returned an error: '.$e->getMessage();
        exit;
        }
        $graphNode = $response->getGraphNode();
    } 


    $houses[] = [
        'url' => $houseUrl,
        'desc' => $singleHouseHtmlDesc
    ];

    $i++;

}


var_dump($houses);

Answer 1

strpos函数无法检查所有行（当您使用\ n时）。所以用preg_match替换它（带s标志），你就完成了：

if (!preg_match("~$houseUrl~s", $houseFile)) {

您的优化代码：

<?php

define('FACEBOOK_SDK_V4_SRC_DIR', __DIR__ . '/src/Facebook/');
require_once __DIR__ . '/src/Facebook/autoload.php';

require 'simple_html_dom.php';

$fb = new Facebook\Facebook([
    'app_id'                => 'xxxxxxxx',
    'app_secret'            => 'xxxxxxxx',
    'default_graph_version' => 'v2.8',
]);

$html = file_get_html('https://www.trulia.com/for_sale/McKinney,TX/300000p_price/SINGLE-FAMILY_HOME_type/date;d_sort/');

$houses = [];

$house = $html->find('.cardContainer', 0);

$houseLink = $house->find('a.tileLink', 0);

$houseUrl = 'https://trulia.com' . $houseLink->href;

file_put_contents("houses.txt", ($houseUrl . "\n"), FILE_APPEND);

$singleHouseHtml = file_get_html($houseUrl);

$singleHouseHtmlDesc = $singleHouseHtml->find('span#corepropertydescription', 0);

$singleHouseHtmlDescText = $singleHouseHtmlDesc->plaintext;

$houseFile = file_get_contents("houses.txt");

if (!preg_match("~$houseUrl~s", $houseFile)) {
    $linkData = [
        'link'    => $houseUrl,
        'message' => $singleHouseHtmlDescText,
    ];
    $pageAccessToken = 'xxxxxxxxx';

    try {
        $response = $fb->post('/me/feed', $linkData, $pageAccessToken);
    } catch (Facebook\Exceptions\FacebookResponseException $e) {
        echo 'Graph returned an error: ' . $e->getMessage();
        exit;
    } catch (Facebook\Exceptions\FacebookSDKException $e) {
        echo 'Facebook SDK returned an error: ' . $e->getMessage();
        exit;
    }
    $graphNode = $response->getGraphNode();
}

$houses[] = [
    'url'  => $houseUrl,
    'desc' => $singleHouseHtmlDesc,
];

var_dump($houses);

Php - 检查文件中是否存在变量值

1 个答案: