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Home Backend Development PHP Tutorial php學(xué)習(xí)筆記-高級(jí)教程-讀取文件、創(chuàng)建文件、寫(xiě)入文件

php學(xué)習(xí)筆記-高級(jí)教程-讀取文件、創(chuàng)建文件、寫(xiě)入文件

Jun 13, 2016 pm 12:03 PM
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php學(xué)習(xí)筆記--高級(jí)教程--讀取文件、創(chuàng)建文件、寫(xiě)入文件

打開(kāi)文件:fopen:fopen(filename,mode);//fopen("test.txt","r”);

打開(kāi)模式:r ?只讀方式打開(kāi),將文件指針指向文件頭
? ? ? ? ? ? ? ? r+ ?讀寫(xiě)方式打開(kāi),將文件指針指向文件頭
? ? ? ? ? ? ? ? w ?寫(xiě)入方式,指向文件頭,如果不存在則嘗試創(chuàng)建
? ? ? ? ? ? ? ? w+ 讀寫(xiě)方式,指向文件頭,如果不存在則嘗試創(chuàng)建
? ? ? ? ? ? ? ? a ?寫(xiě)入方式打開(kāi),指向文件末尾,如果不存在則嘗試創(chuàng)建
? ? ? ? ? ? ? ? a+ 讀寫(xiě)方式打開(kāi),指向文件末尾,如果不存在則嘗試創(chuàng)建?
讀取文件:fread:fread();

readfile(filename):讀取文件內(nèi)容,并把它寫(xiě)入輸出緩沖
<?phpecho readfile("webdictionary.txt");?>
fopen(filename,mode):打開(kāi)文件,創(chuàng)建文件
<?php $myfile = fopen("webdictionary.txt", "r") or die("Unable to open file!");echo fread($myfile,filesize("webdictionary.txt"));fclose($myfile);?>
fopen也用于創(chuàng)建文件,如果打開(kāi)的不存在的文件,此函數(shù)會(huì)創(chuàng)建文件,嘉定文件被打開(kāi)為寫(xiě)入(w)或者增加(a)。
模式 描述
r 打開(kāi)文件為只讀。文件指針在文件的開(kāi)頭開(kāi)始。
w 打開(kāi)文件為只寫(xiě)。刪除文件的內(nèi)容或創(chuàng)建一個(gè)新的文件,如果它不存在。文件指針在文件的開(kāi)頭開(kāi)始。
a 打開(kāi)文件為只寫(xiě)。文件中的現(xiàn)有數(shù)據(jù)會(huì)被保留。文件指針在文件結(jié)尾開(kāi)始。創(chuàng)建新的文件,如果文件不存在。
x 創(chuàng)建新文件為只寫(xiě)。返回 FALSE 和錯(cuò)誤,如果文件已存在。
r+ 打開(kāi)文件為讀/寫(xiě)、文件指針在文件開(kāi)頭開(kāi)始。
w+ 打開(kāi)文件為讀/寫(xiě)。刪除文件內(nèi)容或創(chuàng)建新文件,如果它不存在。文件指針在文件開(kāi)頭開(kāi)始。
a+ 打開(kāi)文件為讀/寫(xiě)。文件中已有的數(shù)據(jù)會(huì)被保留。文件指針在文件結(jié)尾開(kāi)始。創(chuàng)建新文件,如果它不存在。
x+ 創(chuàng)建新文件為讀/寫(xiě)。返回 FALSE 和錯(cuò)誤,如果文件已存在。
fwrite(資源,內(nèi)容)?//寫(xiě)入文件內(nèi)容
<?php $myfile = fopen("newfile.txt", "w") or die("Unable to open file!");$txt = "Bill Gates\n";fwrite($myfile, $txt);$txt = "Steve Jobs\n";fwrite($myfile, $txt);fclose($myfile);?>
fread():函數(shù)讀取打開(kāi)的文件。
fread($myfile,filesize("webdictionary.txt"));

fget(資源,長(zhǎng)度)?//獲取文件內(nèi)容,,若長(zhǎng)度為10,則可以獲得9位
fgets():用來(lái)讀取單行,fgets(file,lenght),lenght可選,規(guī)定要讀取的字節(jié)數(shù)。默認(rèn)是1024字節(jié)。

從?file?指向的文件中讀取一行并返回長(zhǎng)度最多為?length?- 1 字節(jié)的字符串。碰到換行符(包括在返回值中)、EOF 或者已經(jīng)讀取了length?- 1 字節(jié)后停止(要看先碰到那一種情況)。如果沒(méi)有指定?length,則默認(rèn)為 1K,或者說(shuō) 1024 字節(jié)。

若失敗,則返回 false。

<?php $myfile = fopen("webdictionary.txt", "r") or die("Unable to open file!");echo fgets($myfile);fclose($myfile);?>
fgetc():讀取單個(gè)字符

fclose(資源)?//關(guān)閉一個(gè)打開(kāi)的文件資源
unlink(文件)?//刪除一個(gè)文件

feof():檢查是否已經(jīng)到達(dá)結(jié)尾。對(duì)于遍歷未知長(zhǎng)度的數(shù)據(jù)很有用。
<?php $myfile = fopen("webdictionary.txt", "r") or die("Unable to open file!");<span style="color:#999999; margin:0px; padding:0px; border:0px">// 輸出單行直到 end-of-filewhile(!feof($myfile)) {  echo fgets($myfile) . "<br>";}fclose($myfile);?>

filesize(filename):filename為文件名,是字符串類(lèi)型。本函數(shù)的結(jié)果會(huì)被緩存,清試用clearstatcache()來(lái)清除緩存。
filetype();
?
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