我正在嘗試使用通過(guò)獲取請(qǐng)求收集的數(shù)據(jù)編寫一個(gè) json 文件。json文件是一個(gè)二維的字符串?dāng)?shù)組，但是當(dāng)數(shù)據(jù)寫入文件時(shí)，嵌套數(shù)組會(huì)被寫入兩次。<?php//used for parsing htmlinclude("simple_html_dom.php");//read the file $fp = fopen("j.json", "r");$t = fread($fp, filesize("j.json"));fclose($fp);$loaded = json_decode($t);//print the loaded arrayprint_r($loaded);//gathering the data$url = "https://www.soldionline.it/quotazioni/dettaglio/IT0003934657.html";$prezzo1 = file_get_html($url)->find("span[class=val] b", 0)->plaintext;$data = file_get_html($url)->find("span[class=ora] b", 0)->plaintext;$url = "https://www.soldionline.it/quotazioni/dettaglio/IT0003934657.html";$prezzo2 = file_get_html($url)->find("span[class=val] b", 0)->plaintext;$url = "https://www.soldionline.it/quotazioni/dettaglio/IT0003934657.html";$prezzo3 = file_get_html($url)->find("span[class=val] b", 0)->plaintext;//adding the new data to the arrayarray_push($loaded, array($prezzo1, $prezzo2, $prezzo3, $data));//the new json string is parsed and ready to be written$s = json_encode($loaded);//printing stuff to ensure the data is correctecho "<br>".$s.", type=".gettype($s)."<br>";print_r($loaded);//write the new json string to the same file$fp = fopen("j.json", "w");fwrite($fp, $s);fclose($fp);?>j.json 在腳本運(yùn)行之前：[]腳本打印的內(nèi)容：Array ( )[["128,54","128,54","128,54","30\/12"]], type=stringArray ( [0] => Array ( [0] => 128,54 [1] => 128,54 [2] => 128,54 [3] => 30/12 ) )腳本后的 j.json：[["128,54","128,54","128,54","30\/12"],["128,54","128,54","128,54","30\/12"]]我嘗試像這樣打開文件：$fp = fopen("j.json", "r+");然后我更改了腳本：$s = "\"".json_encode($loaded)."\"";echo "<br>".$s.", type=".gettype($s)."<br>";print_r($loaded);fwrite($fp, $s);fclose($fp);我發(fā)現(xiàn)也寫了一個(gè)空值：[]"[["128,54","128,54","128,54","30\/12"]]""null"