PHP_Bible reading and learning (1) - read books and classics, write articles and code

　Read the basics quickly, and then there will be something new and interesting to watch every day.

This book, anyway, has a lot of good reviews, it is `PHP and MySQL Web Development`, written by Machinery Industry Press, Australian, red book, if you are interested, you can read it.

The first article using PHP

1. Getting Started

Read it in 5 minutes, just two clicks.

<span> 1</span> <?<span>php
</span><span> 2</span><span>//</span><span> 3</span><span>//From Bible
</span><span> 4</span><span>//Session1 Based
</span><span> 5</span><span>//
</span><span> 6</span><span>//
</span><span> 7</span><span> 8</span><span>//Chapter1-Use</span><span> 9</span><span>namespace Bible\Basic\Using;
</span><span>10</span><span>11</span><span>//</span><span>引用操作符
</span><span>12</span><span>//这样子赋值的变量享有同一个空间</span><span>13</span><span>$a</span>=3<span>;
</span><span>14</span><span>echo</span><span>$a</span>;<span>echo</span> "<br/>"<span>;
</span><span>15</span><span>$b</span>=&<span>$a</span><span>;
</span><span>16</span><span>echo</span><span>$b</span>;<span>echo</span> "<br/>"<span>;
</span><span>17</span><span>$b</span>=3333<span>;
</span><span>18</span><span>echo</span><span>$a</span>;<span>echo</span> "<br/>"<span>;
</span><span>19</span><span>20</span><span>//</span><span>执行操作符
</span><span>21</span><span>//``</span><span>22</span><span>$out</span>=`ls -<span>la`;
</span><span>23</span><span>echo</span> '<pre class="brush:php;toolbar:false">'.<span>$out</span>.'

';

2. Data storage and retrieval (direct file operation

Everything I want to say is in the code.

<span> 1</span><span>namespace Bible\Basic\DataUsing;
</span><span> 2</span><span>//</span><span>判断文件是否存在——打开文件——锁定文件——读取文件——写入数据——解锁——关闭文件</span><span> 3</span><span>$filename</span>='test.txt'<span>;
</span><span> 4</span><span>if</span> (!<span>file_exists</span>(<span>$filename</span><span>)) {
</span><span> 5</span><span>echo</span> 'The file you want to visit is not exist!';<span>echo</span> "<br/>"<span>;
</span><span> 6</span><span>exit</span><span>;
</span><span> 7</span><span>}
</span><span> 8</span><span>$fp</span>=@<span>fopen</span>(<span>$filename</span>,'r+'<span>);
</span><span> 9</span><span>flock</span>(<span>$fp</span>, LOCK_EX);  <span>//</span><span>锁定文件，只允许一个写入</span><span>10</span><span>while</span> (!<span>feof</span>(<span>$fp</span>)){   <span>//</span><span>按行读取文件内容</span><span>11</span><span>$content</span>=<span>fgets</span>(<span>$fp</span><span>);
</span><span>12</span><span>echo</span><span>$content</span>;<span>echo</span> "<br/>"<span>;
</span><span>13</span><span>}
</span><span>14</span><span>$writeContent</span>='I have something to write into'<span>;
</span><span>15</span><span>fwrite</span>(<span>$fp</span>, <span>$writeContent</span>,<span>strlen</span>(<span>$writeContent</span>));  <span>//</span><span>控制写入长度，兼容性考虑</span><span>16</span><span>flock</span>(<span>$fp</span>, LOCK_UN);  <span>//</span><span>释放锁定</span><span>17</span><span>fclose</span>(<span>$fp</span>);

3. Arrays

Others are cliche, just check it out and use it casually, you are proficient It’s a question of degree, but you still have to know it.

Then I learned the beauty of usort (user-defined sorting):

<span> 1</span><span>//</span><span>Chapter3.Array</span><span> 2</span><span>namespace Bible\Basic\ArrayUsort;
</span><span> 3</span><span>//</span><span>多维数组的排序</span><span> 4</span><span>$array1</span>=<span>array</span>(54654,545,668<span>);
</span><span> 5</span><span>$array2</span>=<span>array</span>(5454,88,37,54<span>);
</span><span> 6</span><span>$array3</span>=<span>array</span>(123,4444,5453<span>);
</span><span> 7</span><span>$arrayAll</span>=<span>array</span>(<span>$array1</span>,<span>$array2</span>,<span>$array3</span><span>);
</span><span> 8</span><span>var_dump</span>(<span>$arrayAll</span><span>);
</span><span> 9</span><span>10</span><span>function</span> dimensionsCompare(<span>$x</span>,<span>$y</span><span>)
</span><span>11</span><span>{
</span><span>12</span><span>if</span> (<span>$x</span>[1]==<span>$y</span>[1<span>]){
</span><span>13</span><span>return</span> 0<span>;
</span><span>14</span>     }<span>elseif</span> (<span>$x</span>[1]<<span>$y</span>[1<span>]){
</span><span>15</span><span>return</span> -1<span>;
</span><span>16</span>     }<span>else</span><span>{
</span><span>17</span><span>return</span> 1<span>;
</span><span>18</span><span>    }
</span><span>19</span><span>}
</span><span>20</span> @<span>usort</span>(<span>$arrayAll</span>, "dimensionsCompare"<span>);
</span><span>21</span><span>var_dump</span>(<span>$arrayAll</span>);

Other explosions are a bit fun

4. String operations and regular expressions. Formula

String sorting

<span>1</span><span>$name</span>=<span>trim</span>(<span>$_POST</span>['name'<span>]);
</span><span>2</span><span>$email</span>=<span>rtrim</span>(<span>$_POST</span>['email'<span>]);
</span><span>3</span><span>$feedback</span>=<span>chop</span>(<span>$_POST</span>['feedback']);

The above has introduced PHP_Bible reading and learning (1) - reading books and classics, writing articles and coding, including bible and php content. I hope it will be helpful to friends who are interested in PHP tutorials.