写入数据也是PHP中常用的文件操作,在PHP中可以使用fwrite()和file_put_contents()函数想文件中写入数据。fwrite()函数还有个别名叫fputs(),它们的用法相同,fwrite()函数语法如下:
int fwrite(resource handle,string string[,int length])
该函数把内容string写入文件指针handle处。如果指定长度length,当写入length个字节时,写入就会停止。如果文件内容长度小于length,则会输出全部文件内容。
file_put_contents()函数是PHP5新加的函数。语法如下:
file_put_contents(file,data,mode,context)
file | 必需。规定要写入数据的文件。如果文件不存在,则创建一个新文件。 |
data | 可选。规定要写入文件的数据。可以是字符串、数组或数据流。 |
mode |
可选。规定如何打开/写入文件。可能的值: |
context |
可选。规定文件句柄的环境。 context 是一套可以修改流的行为的选项。若使用 null,则忽略。 |
返回值
该函数将返回写入到文件内数据的字节数。
注:使用file_put_contents()函数和一次调用fopen()、fwrite()、fclose()函数的功能是一样的。
例如:
$filepath="test.txt";$str="我讨厌这样想你的自己不屑此刻的我太甘心与脆弱为邻没有魂魄化体温成冰尴尬的我始终独自怀抱整个秘密但朋友都说我太过忧郁爱你我不能说看你们拥抱甜蜜谈笑自若忍受逾期的伤心如果我说我真的爱你谁来收拾那些被破坏的友谊如果我忍住这个秘密温暖冬天就会遥遥而无期";$fopen=fopen($filepath,'wb') or die("文件不存在");fwrite($fopen,$str);fclose($fopen);readfile($filepath);file_put_contents($filepath,$str);readfile($filepath);

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