如何在PHP中获取图像（JPEG或PNG）的图像方向（横向或纵向）？
我创建了一个用户可以上传图片的php网站。在我将它们缩小到更小的尺寸之前，我想知道图像是如何定向的，以便正确地缩放它。
感谢您的回答！
答案 0 :(得分：34)
我一直这样做：
list($width, $height) = getimagesize('image.jpg');
if ($width > $height) {
// Landscape
} else {
// Portrait or Square
}
答案 1 :(得分：6)
list($width, $height) = getimagesize("path/to/your/image.jpg");
if( $width > $height)
$orientation = "landscape";
else
$orientation = "portrait";
答案 2 :(得分：1)
如果长度超过宽度，我想您可以检查图像宽度是否长于横向和纵向的长度。
您可以使用简单的IF / ELSE声明执行此操作。
您还可以使用以下功能：Imagick::getImageOrientation
答案 3 :(得分：0)
简单。只需检查宽度和高度，然后比较它们以获得方向。然后相应地调整大小。真的直截了当。如果你想保持纵横比，但是适合某个方框你可以使用这样的东西：
public static function fit_box($box = 200, $x = 100, $y = 100)
{
$scale = min($box / $x, $box / $y, 1);
return array(round($x * $scale, 0), round($y * $scale, 0));
}
答案 4 :(得分：0)
我使用广义缩小算法。 ..
function calculateSize($width, $height){
if($width <= maxSize && $height <= maxSize){
$ratio = 1;
} else if ($width > maxSize){
$ratio = maxSize/$width;
} else{
$ratio = maxSize/$height;
}
$thumbwidth = ($width * $ratio);
$thumbheight = ($height * $ratio);
}
这里最大尺寸是我初始化为高度和宽度120px的尺寸。 。 。这样缩略图就不会超过那个尺寸。 。 ..
这适用于我，无论是横向还是纵向，都可以使用
答案 5 :(得分：0)
我正在使用此速记。共享以防万一有人需要一站式解决方案。
'use strict';
/*
* Copyright IBM Corp All Rights Reserved
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* Chaincode Invoke
*/
var Fabric_Client = require('fabric-client');
var path = require('path');
var util = require('util');
var os = require('os');
var fs = require('fs');
//
var fabric_client = new Fabric_Client();
// setup the fabric network
var channel = fabric_client.newChannel('mychannel');
var peer = fabric_client.newPeer('grpcs://nd-xxxxxxxxxxxxxxxxxxxxxxxxxx.m-xxxxxxxxxxxxxxxxxxxxxxxxxx.n-xxxxxxxxxxxxxxxxxxxxxxxxxx.managedblockchain.us-east-1.amazonaws.com:30003',
{ pem: fs.readFileSync('/home/ec2-user/managedblockchain-tls-chain.pem').toString(), 'ssl-target-name-override': null});
channel.addPeer(peer);
var order = fabric_client.newOrderer('grpcs://orderer.n-xxxxxxxxxxxxxxxxxxxxxxxxxx.managedblockchain.us-east-1.amazonaws.com:30001',
{ pem: fs.readFileSync('/home/ec2-user/managedblockchain-tls-chain.pem').toString(), 'ssl-target-name-override': null});
channel.addOrderer(order);
//
var member_user = null;
var store_path = path.join(__dirname, 'hfc-key-store');
console.log('Store path:'+store_path);
var tx_id = null;
// create the key value store as defined in the fabric-client/config/default.json 'key-value-store' setting
Fabric_Client.newDefaultKeyValueStore({ path: store_path
}).then((state_store) => {
// assign the store to the fabric client
fabric_client.setStateStore(state_store);
var crypto_suite = Fabric_Client.newCryptoSuite();
// use the same location for the state store (where the users' certificate are kept)
// and the crypto store (where the users' keys are kept)
var crypto_store = Fabric_Client.newCryptoKeyStore({path: store_path});
crypto_suite.setCryptoKeyStore(crypto_store);
fabric_client.setCryptoSuite(crypto_suite);
// get the enrolled user from persistence, this user will sign all requests
return fabric_client.getUserContext('user1', true);
}).then((user_from_store) => {
if (user_from_store && user_from_store.isEnrolled()) {
console.log('Successfully loaded user1 from persistence');
member_user = user_from_store;
} else {
throw new Error('Failed to get user1.... run registerUser.js');
}
// get a transaction id object based on the current user assigned to fabric client
tx_id = fabric_client.newTransactionID();
console.log("Assigning transaction_id: ", tx_id._transaction_id);
// createCar chaincode function - requires 5 args, ex: args: ['CAR12', 'Honda', 'Accord', 'Black', 'Tom'],
// changeCarOwner chaincode function - requires 2 args , ex: args: ['CAR10', 'Dave'],
// must send the proposal to endorsing peers
var request = {
//targets: let default to the peer assigned to the client
chaincodeId: 'fabcar',
fcn: 'createCar',
args: ['CAR10', 'Chevy', 'Volt', 'Red', 'Nick'],
chainId: 'mychannel',
txId: tx_id
};
// send the transaction proposal to the peers
return channel.sendTransactionProposal(request);
}).then((results) => {
var proposalResponses = results[0];
var proposal = results[1];
let isProposalGood = false;
if (proposalResponses && proposalResponses[0].response &&
proposalResponses[0].response.status === 200) {
isProposalGood = true;
console.log('Transaction proposal was good');
} else {
console.error('Transaction proposal was bad');
}
if (isProposalGood) {
console.log(util.format(
'Successfully sent Proposal and received ProposalResponse: Status - %s, message - "%s"',
proposalResponses[0].response.status, proposalResponses[0].response.message));
// build up the request for the orderer to have the transaction committed
var request = {
proposalResponses: proposalResponses,
proposal: proposal
};
// set the transaction listener and set a timeout of 30 sec
// if the transaction did not get committed within the timeout period,
// report a TIMEOUT status
var transaction_id_string = tx_id.getTransactionID(); //Get the transaction ID string to be used by the event processing
var promises = [];
var sendPromise = channel.sendTransaction(request);
promises.push(sendPromise); //we want the send transaction first, so that we know where to check status
// get an eventhub once the fabric client has a user assigned. The user
// is required bacause the event registration must be signed
let event_hub = channel.newChannelEventHub(peer);
// using resolve the promise so that result status may be processed
// under the then clause rather than having the catch clause process
// the status
let txPromise = new Promise((resolve, reject) => {
let handle = setTimeout(() => {
event_hub.unregisterTxEvent(transaction_id_string);
event_hub.disconnect();
resolve({event_status : 'TIMEOUT'}); //we could use reject(new Error('Trnasaction did not complete within 30 seconds'));
}, 3000);
event_hub.registerTxEvent(transaction_id_string, (tx, code) => {
// this is the callback for transaction event status
// first some clean up of event listener
clearTimeout(handle);
// now let the application know what happened
var return_status = {event_status : code, tx_id : transaction_id_string};
if (code !== 'VALID') {
console.error('The transaction was invalid, code = ' + code);
resolve(return_status); // we could use reject(new Error('Problem with the tranaction, event status ::'+code));
} else {
console.log('The transaction has been committed on peer ' + event_hub.getPeerAddr());
resolve(return_status);
}
}, (err) => {
//this is the callback if something goes wrong with the event registration or processing
reject(new Error('There was a problem with the eventhub ::'+err));
},
{disconnect: true} //disconnect when complete
);
event_hub.connect();
});
promises.push(txPromise);
return Promise.all(promises);
} else {
console.error('Failed to send Proposal or receive valid response. Response null or status is not 200. exiting...');
throw new Error('Failed to send Proposal or receive valid response. Response null or status is not 200. exiting...');
}
}).then((results) => {
console.log('Send transaction promise and event listener promise have completed');
// check the results in the order the promises were added to the promise all list
if (results && results[0] && results[0].status === 'SUCCESS') {
console.log('Successfully sent transaction to the orderer.');
} else {
console.error('Failed to order the transaction. Error code: ' + results[0].status);
}
if(results && results[1] && results[1].event_status === 'VALID') {
console.log('Successfully committed the change to the ledger by the peer');
} else {
console.log('Transaction failed to be committed to the ledger due to ::'+results[1].event_status);
}
}).catch((err) => {
console.error('Failed to invoke successfully :: ' + err);
});
首先，它检查图像是否不是1：1（正方形）。如果不是，则确定方向（横向/纵向）。
我希望有人觉得这有帮助。