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Homephp教程php手册用PHP或JS获取图片大小,高宽尺寸


$arr=getimagesize("images/album_01.gif");
echo $arr[3];
$strarr=explode("\"",$arr[3]);
echo $strarr[1];
?>



演示图片等比例缩小
<script> <br/>function Wa_SetImgAutoSize(img) <br/>{ <br/>//var img=document.all.img1;//获取图片 <br/>var MaxWidth=200;//设置图片宽度界限 <br/>var MaxHeight=100;//设置图片高度界限 <br/>var HeightWidth=img.offsetHeight/img.offsetWidth;//设置高宽比 <br/>var WidthHeight=img.offsetWidth/img.offsetHeight;//设置宽高比 <br/>alert("test"+img.offsetHeight+img.fileSize);<br/>if(img.offsetHeight>1) alert(img.offsetHeight);<br/>if(img.readyState!="complete"){<br/> return false;//确保图片完全加载<br/>}<P>if(img.offsetWidth>MaxWidth){ <br/>img.width=MaxWidth; <br/>img.height=MaxWidth*HeightWidth; <br/>} <br/>if(img.offsetHeight>MaxHeight){ <br/>img.height=MaxHeight; <br/>img.width=MaxHeight*WidthHeight; <br/>} <br/>} <P>function CheckImg(img) <br/>{ <br/> var message="";<br/> var MaxWidth=1;//设置图片宽度界限 <br/> var MaxHeight=1;//设置图片高度界限 <br/> <br/> if(img.readyState!="complete"){<br/> return false;//确保图片完全加载<br/> }<br/> if(img.offsetHeight>MaxHeight) message+="\r高度超额:"+img.offsetHeight;<br/> if(img.offsetWidth>MaxWidth) message+="\r宽度超额:"+img.offsetWidth;<br/> if(message!="") alert(message);<br/>} <br/></script>


用PHP或JS获取图片大小,高宽尺寸






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