query: Difference between double colon and arrow operators in PHP?
positive_passages.docid: 25451
positive_passages.text: What's the difference between :: (double colon) and -> (arrow) in PHP?
negative_passages.docid: 113103
negative_passages.text: Difference between period and comma when concatenating with echo versus return?
negative_passages.docid: 72270
negative_passages.text: Why does the arrow (->) operator in C exist?
negative_passages.docid: 143637
negative_passages.text: What does ${ } mean in PHP syntax?
negative_passages.docid: 36293
negative_passages.text: What's the difference between using single and double quotation marks/inverted commas?
negative_passages.docid: 116312
negative_passages.text: How to use double or single brackets, parentheses, curly braces
negative_passages.docid: 9173
negative_passages.text: What are the PHP operators "?" and ":" called and what do they do?
negative_passages.docid: 19212
negative_passages.text: When do extra parentheses have an effect, other than on operator precedence?
negative_passages.docid: 76012
negative_passages.text: Why are functions and methods in PHP case-insensitive?
negative_passages.docid: 2203
negative_passages.text: String concatenation: concat() vs "+" operator
negative_passages.docid: 129267
negative_passages.text: What does wrapping a procedural block in curly braces do in php?
negative_passages.docid: 45656
negative_passages.text: What's the difference between semicolon and double ampersand &&
negative_passages.docid: 11676
negative_passages.text: Why do the less than symbol () appear wrong as upside down exclamation (¡) or question mark (¿)?
negative_passages.docid: 15994
negative_passages.text: Reference — What does this symbol mean in PHP?
negative_passages.docid: 19211
negative_passages.text: PHP if not equal(!=) and or (||) issue. Why doesnt this work?
negative_passages.docid: 83053
negative_passages.text: Difference between [square brackets] and *asterisk
negative_passages.docid: 6276
negative_passages.text: Difference between \xx{} and \mathxx{}?