variables

问题 Are there any "general rules" as to when one is preferable to the other? The context of this question is: I asked a different question regarding host association yesterday (link) and in the comments, I was advised to use host association with caution. The reason being that through host association, it is easy to inadvertently modify variables since the subroutines have unrestricted access to all variables that are declared in the module. To illustrate this, I will use the following code

问题 In VueJS, is there a way to interpolate a string within a string, either in the template or in the script? For example, I want the following to display 1 + 1 = 2 instead of 1 + 1 = {{ 1 + 1 }} . <template> {{ myVar }} </template> <script> export default { data() { "myVar": "1 + 1 = {{ 1 + 1 }}" } } </script> Edit: to better illustrate why I would need this, here's what my actual data looks like: section: 0, sections: [ { inputs: { user: { first_name: { label: "First Name", type: "text", val:

问题 I have an index.php which is like: require_once("../resources/config.php"); require_once(LIBRARY_PATH . "/mysql.php"); ... if(checkIfMailExists($email)) { $error = true; $errormsg = "This e-mail is already in use!"; } mysql.php is: try { $pdo = new PDO('mysql:host=' . $config['db']['db1']['host'] . ';dbname=' . $config['db']['db1']['dbname'], $config['db']['db1']['username'], $config['db']['db1']['password']); }catch(PDOException $e){ echo "Cant connect to mysql DB!"; } function

问题 I'm running a PHP script and continue to receive errors like: Notice: Undefined variable: my_variable_name in C:\wamp\www\mypath\index.php on line 10 Notice: Undefined index: my_index C:\wamp\www\mypath\index.php on line 11 Line 10 and 11 looks like this: echo "My variable value is: " . $my_variable_name; echo "My index value is: " . $my_array["my_index"]; What is the meaning of these error messages? Why do they appear all of a sudden? I used to use this script for years and I've never had

问题 I have the following json file cat permissions.json { "foo1.bar1@email.com": [ "projects/development/roles/superadmin", "compute.networkAdmin" ], "foo2.bar2@email.co": [ "compute.networkAdmin" ] } Now I can do something like this quite well with jq $ jq -r '.["foo1.bar1@email.com"]' permissions.json [ "projects/development/roles/superadmin", "compute.networkAdmin" ] Now the email needs to come from a variable So my for loop is such that for USER in $(jq -r 'keys[]' permissions.json) do echo $

问题 I've got a function that I've written that populates a URL (that contains an image) based on the browser language. This subsequent URL is then written to a variable. All the images are based on language, so for germany it will be "de.gif", France would be "fr.gif" and so on. My question is how can I call this variable in my HTML page? To help me to better illustrate this problem here is the JavaScript, please note this is an EXTERNAL .js file called in the of this HTML page: function IABEU

问题 I've got a function that I've written that populates a URL (that contains an image) based on the browser language. This subsequent URL is then written to a variable. All the images are based on language, so for germany it will be "de.gif", France would be "fr.gif" and so on. My question is how can I call this variable in my HTML page? To help me to better illustrate this problem here is the JavaScript, please note this is an EXTERNAL .js file called in the of this HTML page: function IABEU

问题 I've got a function that I've written that populates a URL (that contains an image) based on the browser language. This subsequent URL is then written to a variable. All the images are based on language, so for germany it will be "de.gif", France would be "fr.gif" and so on. My question is how can I call this variable in my HTML page? To help me to better illustrate this problem here is the JavaScript, please note this is an EXTERNAL .js file called in the of this HTML page: function IABEU

问题 I'm looking for a sort of reversed func_get_args() . I would like to find out how the parameters were named when function was defined. The reason for this is I don't want to repeat myself when using setting variables passed as arguments through a method: public function myFunction($paramJohn, $paramJoe, MyObject $paramMyObject) { $this->paramJohn = $paramJohn; $this->paramJoe = $paramJoe; $this->paramMyObject = $paramMyObject; } Ideally I could do something like: foreach (func_get_params() as

问题 So I have a method that looks like this: public Maze(String[] textmaze, int startRow, int startCol, int finishRow, int finishCol){ int numRows = textmaze.length; int numCols = textmaze[0].length; int [][] x = new int[numRows][numCols]; } So I want to use the variables x, numRows and numCols in other methods however numRows and numCols needs the String textmaze which must be passed in as a parameter and the main method where this method is called is in another class which I'm not allowed to