31. 删除文件夹内容
function Delete($path)
{
if (is_dir($path) === true)
{
$files = array_diff(scandir($path), array('.', '..'));
foreach ($files as $file)
{
Delete(realpath($path) . 'https://www.jb51.net/' . $file);
}
return rmdir($path);
}
else if (is_file($path) === true)
{
return unlink($path);
}
return false;
}
语法：
<?php
$path = "images/";
Delete($path); // This will delete images folder along with its contents.
?>
32. 搜索和高亮字符串中的关键字
function highlighter_text($text, $words)
{
$split_words = explode( " " , $words );
foreach($split_words as $word)
{
$color = "#4285F4";
$text = preg_replace("|($word)|Ui" ,
"<span style=https://www.jb51.net/article/\"color:".$color.";\"><b>$1</b></span>" , $text );
}
return $text;
}
语法：
<?php
$string = "I like chocolates and I like apples";
$words = "apple";
echo highlighter_text($string ,$words);
?>
33. 写入文件
<?
$filename = 'blog.csv';
$fp = fopen($filename, 'w');
$output = " Hello ";
$output .= " World! ";
$output .= "\r\n";
fputs($fp, $output);
fclose($fp);
?>
34. 根据 URL 下载图片
function imagefromURL($image,$rename)
{
$ch = curl_init($image);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
$rawdata=curl_exec ($ch);
curl_close ($ch);
$fp = fopen("$rename",'w');
fwrite($fp, $rawdata);
fclose($fp);
}
语法：
<?php
$url = "http://koonk.com/images/logo.png";
$rename = "koonk.png";
imagefromURL($url,$rename);
?>
35. 检测 URL 是否有效
function isvalidURL($url)
{
$check = 0;
if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
$check = 1;
}
return $check;
}
语法：
<?php
$url = "http://koonk.com";
$check = checkvalidURL($url);
echo $check; //if returns 1 then URL is valid.
?>
36. 生成二维码
function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0')
{
$types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
{
$type = "TXT";
}
if (!preg_match('/^'.$types[$type].'https://www.jb51.net/', $data))
{
$data = str_replace("\\", "", $types[$type]).$data;
}
$ch = curl_init();
$data = urlencode($data);
curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
$response = curl_exec($ch);
curl_close($ch);
return $response;
}
语法：
<?php
header("Content-type: image/png");
echo qr_code("http://koonk.com", "URL");
?>
