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20 Cards in this Set
- Front
- Back
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This tag causes PHP to start interpreting code:
And the short version is: |
<?php ... ?>
<? ... ?> |
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What are the two types of comment tags?
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// This is a one-line tag.
/* This is a two line tag. */ |
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What character must be placed at the end of every PHP statement?
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A semi-colon (;)
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Which symbol is used to preface all PHP variable names?
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A dollar sign, with the exception of constants.
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What can a variable store?
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A string, a number, or other data.
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What is the difference between $variable = 1 and $variable == 1?
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$variable = 1 is an assignment statement and sets the value
$variable == 1 is a comparison operator |
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Why are underscores allowed in variable names and hyphens are not?
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A hyphen is reserved for subtraction operators.
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Are variable names case-sensitive?
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Yes.
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Can you use spaces in variable names?
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No.
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How do you convert one variable type to another?
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PHP will automatically convert variables when referenced.
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What is the difference between ++$j and $j++?
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There is no difference unless the value is being tested/assigned/passed, in which case ++$j increments before operation and $j++ increments after operation.
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Are the operators && and "and" interchangeable?
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Usually, except where precedence is important.
&& is higher priority than "and". |
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How can you create a multiline echo or assignment?
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"This is
multi-line echo." <<<_WHATEVERUWANT This is a multi-line echo. _WHATEVERUWANT |
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Can you redefine a constant?
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No; they retain their value until the program terminates.
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How do you escape a quotation mark?
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\' or \"
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What is the difference between the echo and print commands?
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echo is a construct with multiple arguments
print is a PHP function with a single argument |
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What is the purpose of functions?
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To separate discrete sections of code into their own self-contained sections, referenced by a single function name.
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How can you make a variable accessible to all parts of a PHP program?
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By declaring it as global
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If you generate data within a function, how do you convey it to the rest of the program?
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By returning a value or modifying a global variable
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What is the result of combining a string with a number?
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Another string
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