PHP常用函数及方法 - 整理

 

 

获取图像信息 getimagesize()

array getimagesize ( string $filename [, array &$imageinfo ] )

#本地图片
<?php
list($width, $height, $type, $attr) = getimagesize("runoob-logo.png");
echo "宽度为：" . $width;
echo "高度为：" . $height;
echo "类型为：" . $attr;
?>

#远程图片
<?php
$remote_png_url = 'http://www.runoob.com/wp-content/themes/w3cschool.cc/assets/img/logo-domain-green2.png';
$img_data = getimagesize($remote_png_url);
print_r($img_data );
?>

Array
(
    [0] => 290  //宽
    [1] => 69    //高
    [2] => 3
    [3] => width="290" height="69"
    [bits] => 8
    [mime] => image/png
)

去除数组中重复的元素值  array_unique($array)

<?php 
    $a=array("a"=>"Cat","b"=>"Dog","c"=>"Cat"); 
    print_r(array_unique($a)); 
?> 

判断字符串是否全由数字组成

<?
$str='1234425';
if(eregi('^[0-9]*$',$str)){
echo '此字串由全数字组成';
}
?>