Full stack engineers come here! PHP Javascript syntax comparison and quick check

                                                       

#Qp, JavaScript gram -comparison, speed check

all to see that there are more computer languages ​​to learn, often mixing various functions of different languages. As a full-stack PHPer, the syntax of PHP and JavaScript is often unclear. I need to search on Baidu and check the manual to find the Internet speed. Why not bookmark this article, print it out, and put it aside for quick reference.

Related recommendations: "PHP Video Tutorial" "javascript Advanced Tutorial"

Some array map functions of JavaScript are implemented by jQuery. After ES6, an official implementation was released. PHP's array and string related functions are named randomly, making it easier to confuse these three.

Coding style

##Line breakNewlineCase sensitivityOnly variable names are case-sensitiveVariable names, function names, class names, etc. are all case-sensitiveStrict modedeclare( strict_types=1); (new feature of PHP7)"use strict";(introduced in ECMAScript 5)

Language	PHP	JavaScript
	; is required, \n is not required	\n, and ; are not required, except for(;;)

Variable declaration

LanguagePHPJavaScriptConstantconst VAR_NAME = 12; const MY_FAV = 7; (standard introduced in ES6) Local variables$varName = 12; (PHP only has function scope and global scope)function myFunc() { Global variables$varName = 12; var varName1 = 3; Global symbol table$GLOBALS arraywindow object (html environment) is a defined variablenullundefined

Variable conversion

	define('VAR_NAME', 12);
		var varName = 3; if (true) { let varName2 = 2; } } (Var must be declared within the function scope, otherwise the variable is globally accessible.) (The variable modified by let is block level Scope, introduced in ES6)
	function myFunc() { global $varName; } (To use global variables within a function, you must use global variables to declare external global variables)	varName2 = 2; function myFunc() { varName3 = 6; } (Writing here varName1, 2, and 3 are all global variables)
		global object (nodejs environment)

##Convert to string$bar = (string) $foo; str = String(123) Convert to array$arr ​​= (array) new stdClass();(requires multi-line function to complete)Convert to object$obj = (object) array('1' => 'foo');let arr = ['yellow', 'white ', 'black']; Convert timestamp to date$date = new DateTime(); var date = new Date(1398250549490);Character to date$dateObj = new DateTime($dateStr);var myDateObj = new Date(Date.parse(datetimeStr))convert to empty(unset) $ var; \ does not delete the variable or unset its value. Just return NULL valueGet the type$varType = gettype($var); varType = typeof myCarClass judgment$boolRe = $a instanceof MyClass;boolRe = a instanceof MyClass

Language	PHP	JavaScript
Convert to bool, boolean	$bar = (boolean) $foo; $bar = (bool) $foo; $bar = boolval($foo );	boolVal = Boolean('')
Convert to int	$bar = (int) $foo; $bar = (integer) $foo; $bar = intval($foo);	intVal = Number(“314”) intVal = parseInt(“3.14”)
Convert to float	$bar = (float) $foo; $bar = (double) $foo; $bar = (real) $foo; $ bar = floatval($foo);	floatVal = Number(“3.14”) floataVal = parseFloat(“12”)
	$bar = strval($foo);	str = (123).toString()
		let obj = {...arr}
	$date->setTimestamp(1171502725);
		new Date() .constructor === Date

Magic Variable

LanguagePHPJavaScriptCurrent file$filePath = __FILE__;filePath = __filenameCurrent directory$currentDir = __DIR__;curDir = __dirnameCurrent line of code__LINE__Current function__FUNCTION__Current class__CLASS__##Current namespace

Operators

__NAMESPACE__

Language	PHP	JavaScript
Ternary (ternary) operation	$a = $a ? $a : 1;//The first type $a = $a ? : 1; //The second type of PHP5.3 supports	re = isMember ? 2.0 : '$10.00'
merge operator	$a = $a ?? 1; // PHP7 supports

##array

LanguagePHPJavaScript##Basic $array = [ “foo” => “bar”, “bar” => “foo”]; // PHP 7 SyntaxAppend $arr[key1] = value1; mycars[0]=”Saab”new##loop

$a=array(0 => 1, 1 => 2,4,5,6);	b = [1,2,3]
$arr ​​= array();	$arr[key2] = value2; var mycars=new Array()	mycars[1]=”Volvo” mycars[2]=”BMW”
	##var mycars = new Array(“Saab”,”Volvo ","BMW")

language PHP##for loopfor ($i=1; $i<=5; $i ) { echo $i ; foreach ($x as $value) { echo $value; }var person= {fname:”John”,lname:”Doe”,age:25 }; $i ; }x=x “num is “ i ;##do while loop} while ( $ i<= 5);do { i ;

Array function

JavaScript
}	for (var i=0; i < cars.length ; i ) { document.write (cars[i]); }	##foreach, for in loop $x=array(“one”,”two”,”three” );
	for (x in person) { txt=txt person[x]; }	##while loop while ($ i <= 5) { echo $i ;
while (i<5) {	i ; }	do { $i ; echo $i;
console.log(i);	} while (i < 5);

##Splice two Stringarray_merge($arr1, $arr2);arr1.concat(arr2)Delete array elementsunset($arr[$key]);delete arr1[key]Splice the array into a stringimplode(', ', $arr1);arr.join(',')Delete and return the last element of the array$re = array_pop($ arr1);re = arrayObject.pop()Add an element to the end of the arrayarray_push($arr1, $var1); len = arrayObject.push(newele1)Delete the first element of the array and return it$re = array_shift($arr1) ;re = arrayObject.shift()Add one or more elements to the beginning of the arrayarray_unshift($arr1, $var1) ;len = arrayObject.unshift(newele1)Return the selected element from the existing array$newArr = array_splice($ arr1,$start,$len);newArr = arrayObject.slice(start,end)Sortsort($arr1); arrayObject.sort(sortByFunc = null)Reverse the order of elements in the arrayarray_reverse(&$arr, $keepKeys = true); arrayObject.reverse()##each function{alert( index “: “ value );The callback function iteratively reduces the array to a single value $carry = $item;function getSum(total, num) {Use callback function to filter cells in array // returns whether the input integer is odd

Language	PHP	JavaScript
Get the number of elements in the array	count($arr);	arrayObject.length
function map_Spanish($n)	echo $n; } $b = array(“uno”, “dos” , "tres", "cuatro", "cinco"); $c = array_map("show_Spanish", $a); $.each([ 52, 97 ], function( index, value ) {	}); // ↑ This is the jQuery way const items = ['item1', 'item2', 'item3'] ; items.forEach(function(item, index, arr){ console.log('key:' index ' value:' item); }); (Introduced in ES6)
function sum($carry, $item) {	return $carry; } $a = array(1, 2, 3, 4, 5); var_dump(array_reduce($a, “sum”)); // int(15) var numbers = [65, 44, 12, 4];	return total num; } console.log(numbers.reduce (getSum)); Started from ECMAScript 3
function odd($var) {	return($var & 1); } $array1 = array(“a”=>1, “b”=>2, “c”= >3, “d”=>4, “e”=>5); echo “Odd :\n”; array_filter($array1, “odd”); function isBigEnough(element) { return element >= 10;	} var filtered = [12, 5, 8, 130, 44].filter(isBigEnough); \\ JavaScript 1.6 introduced

characters

##character splicing$str1 . $str2str1 str2

Language	PHP	JavaScript
Create	$str = "a string"; \\What's special is that PHP can parse variables in double quote characters $str2 = 'tow string';	var carname = "Volvo XC60"; var carname = 'Volvo XC60'; (Similarly, escape characters can be used in double quotes)
Multi-line characters	$bar = << foo bar EOT;	var tmpl ='\ !!! 5\ html \ include header\ body\ include script'

##String function

##LanguagePHPJavaScriptGet the character lengthstrlen($str);string.lengthGet substringsubstr ( string $string , int $start [, int $length ] ): stringstring.substr(start,length ) Use one string to split another string$pizza = “piece1 piece2 piece3 piece4 piece5 piece6 ”;echo $pieces[0]; // piece1\ output:How,are,you,doing,today?Remove whitespace characters at the beginning and end of the string (or Other characters) trim ( string $str [, string $character_mask = “ \t\n\r\0\x0B” ] ) : string Find the first occurrence of a string$mystring = 'abcsdfdsa'; Convert the string to lowercasestrtolower ( string $string ): stringstring.toLowerCase()Convert the string to uppercasestrtoupper ( string $string ) : stringstring.toUpperCase()##Function

	str.slice(1,5);
$pieces = explode(“ “, $pizza);	var str=”How are you doing today?”; var n=str.split(“ “);
(PHP functions are more customizable)	var str = “ string “; alert(str.trim());
$pos = strpos($mystring, 'cs');	var str="Hello world, welcome to the universe."; var n=str.indexOf ("welcome");

LanguagePHPFunction parameters$argv = func_get_args (void);

JavaScript

var argv = arguments \\ Direct object within a function

Object

Language	PHP	JavaScript
Empty object	$obj = new stdClass();	var obj = new Object(); // Or person={firstname:” John",lastname:"Doe",age:50,eyecolor:"blue"};
Object properties	$obj = new stdClass(); $obj->a = 12;	var myCar = new Object(); myCar.year = 1969; // js can also be in array form myCar["year"] = 1969;
Delete property	unset($obj->a);	delete object.property delete object[' property']

##Regular

##LanguageCreate regular expressionPCRE Regular var myRe = new RegExp(“d(b )d”, “g” );POSIX regular

PHP	JavaScript
$pattern = “/.*/i”;	var re = /ab c/;
int preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )	var myRe = /d(b )d/g;
ereg ( string $pattern , string $string [, array &$regs ] ) : int	(none)

Mathematical functions

##LanguagePHPJavaScriptRandom function$re = mt_rand($min, $max); // Returns the value between min～max Random integerMath.random() // Returns a random number between 0 ~ 1x raised to the yth powerpow(x ,y)Math.pow(x,y)##Package, space

LanguagePHP##Namespacenamespace MySpace; (None)Introduce packageuse Package; use Package as Package1, Package2; import “my-module”; include 'b.php'; require 'bc.php';< ;script type='text/javascript' src='b.js'>

JavaScript
const http = require('http') (CommonJS specification)	import {foo as fo, bar} from “my-module”; (es6 implementation, import requires and export Use together)	Introduce files
	(only used in html)	<h2> <span class="header-link octicon octicon-link"></span>Others</h2> <table> <thead><tr class="firstRow"> <th style="border-color: rgb(221, 221, 221);">Language</th> <th style="border-color: rgb(221, 221, 221);">PHP</th> <th style="border-color: rgb(221, 221, 221);">JavaScript</th> </tr></thead> <tbody> <tr> <td style="border-color: rgb(221, 221, 221);">Expand, variable function</td> <td style="border-color: rgb(221, 221, 221);">function add(...$numbers) { <br> foreach ($numbers as $n) { <br> $sum = $n; <br> }<br>} <br>echo add(1, 2, 3, 4); // PHP5.6 starts to support </td> <td style="border-color: rgb(221, 221, 221);">function myFunction(x, y, z) { } <br> var args = [0, 1, 2]; <br> myFunction(…args); (supported from ES6) </td> </tr> <tr> <td style="border-color: rgb(221, 221, 221);">Destructuring</td> <td style="border-color: rgb(221, 221, 221);">$my_array = array('a' =>'Dog','b'=>'Cat','c'=>'Horse'); <br> list($a, $b, $c) = $my_array; <br>/ /php5, if the php7 version supports the following syntax<br> ['a'=>$a, 'c'=>$c] = $my_array;</td> <td style="border-color: rgb(221, 221, 221);">var date1 = [1970, 2, 1];<br>[ year, mouth ]= date1;<br>var date2 = {year: 1980, mouth: 3, day: 21};<br>({ mouth } = date2);<br>console. log(date1);<br>console.log(year);<br>console.log(mouth);</td> </tr> </tbody> </table> <p>Welcome to collect it, if you think it needs to be added place, please leave a message. </p>

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