T_CONSTANT_ENCAPSED_STRING

Question

我在PHP中遇到语法错误问题。感谢有人能帮我理解这里出了什么问题。

  

解析错误：语法错误，意外T_CONSTANT_ENCAPSED_STRING，期待＆＃39;，＆＃39;或＆＃39;;＆＃39;在：

导致此问题的一行是：

if ($custom_logo){
     echo '#logo a { background: url(''.$custom_logo.'') left center no-repeat; }';
}

Answer 1

当你想要使用2次单引号时，你需要使用转义字符...

if ($custom_logo){ echo '#logo a { background: url(\''.$custom_logo.'\') left center no-repeat; }'; }

Answer 2

使用 heredoc 是另一种方法，请确保LOGO_CSS是该行的第一个文本，没有前导空格。

var board = [
  ["m","t","h","v","g","y","m","w","n","q"],
  ["q","e","v","f","a","k","n","c","c","k"],
  ["x","s","r","e","r","c","m","c","h","a"],
  ["j","z","f","w","g","i","o","t","b","l"],
  ["x","v","j","m","x","q","s","s","v","c"],
  ["m","i","i","a","e","u","t","t","j","m"],
  ["t","n","j","w","h","j","e","m","b","d"],
  ["v","n","t","f","r","y","b","q","v","a"],
  ["k","q","x","b","q","w","c","i","v","g"],
  ["s","o","m","e","t","h","i","n","g","t"]
];

const directions = [
  'horizontal',
  'vertical'
];

function chooseRandomPlace() {
  return [Math.floor(Math.random() * 10),
          Math.floor(Math.random() * 10)];
}

let i = 0;
function horizontal(word) {
  i++;
  console.log(i);
  let wordLength = word.length;
  let [x, y] = chooseRandomPlace();
  if (9 - y < wordLength) return horizontal(word);

  for (let i = 0; i < wordLength; i++) {
    if (typeof board[x][y + i] !== 'string') {
      return horizontal(word)
    }
  }

  for (let i = 0; i < wordLength; i++) {
    board[x][y + i] = {value: word[i]};
  }
}

function vertical(word) {
  i++;
  console.log(i);
  let wordLength = word.length;
  let [x, y] = chooseRandomPlace();
  if (9 - x < wordLength) return vertical(word);


  for (let i = 0; i < wordLength; i++) {
    if (typeof board[x + i][y] !== 'string') {
      return vertical(word);
    }
  }

  for (let i = 0; i < wordLength; i++) {
    board[x + i][y] = {value: word[i]};
  }
}

function alocate(word) {
  let direction = directions[Math.floor(Math.random() * directions.length)];
  if (direction === 'horizontal') {
    horizontal(word)
  } else {
    vertical(word);
  }
  console.log(JSON.stringify(board));
}

const words = ['SOMETHIN', 'SOMETHIN', 'SOMETHIN', 'SOMETHIN', 'SOMETHIN'];
for (let word of words) {
  let location = alocate(word);
}

http://php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc