What are the commonly used expressions in php?

Commonly used expressions in PHP include: arithmetic expressions: used for mathematical operations comparison expressions: comparing two values ​​logical expressions: combinational logic conditional expressions: simplified if-else statements array expressions : Create array string expression: Create string

Commonly used expressions in PHP

Provided in PHP A variety of expressions for performing logical calculations in code. The following are some of the most commonly used expressions in PHP:

1. Arithmetic expressions

Arithmetic expressions are used to perform mathematical operations. The following operators can be used:

• Addition ( )
• Subtraction (-)
• Multiplication (*)
• Division (/)
• Modulo operation (%)

For example:

<code class="php">$result = 10 + 5 * 2; // 20</code>

2. Comparison expression

Comparison expressions are used to compare two values. The following operators can be used:

• Equal (==)
• Not equal (!=)
• Greater than (>)
• Less than (<)
• Greater than or equal to (>=)
• Less than or equal to (<=)

For example:

<code class="php">if ($x == 10) {
    // 执行操作
}</code>

3. Logical expressions

Logical expressions are used to combine logical conditions. The following operators can be used:

• AND (&&)
• OR (||)
• NOT (!)

For example:

<code class="php">if ($x > 10 && $y < 5) {
    // 执行操作
}</code>

4. Conditional expression (ternary operator)

Conditional expression is a simplified if-else statement. It has the following syntax:

<code class="php">(condition) ? true_value : false_value</code>

For example:

<code class="php">$result = ($x > 0) ? "positive" : "negative";<p><strong>5. Array expression</strong></p>
<p>Array expression is used to create array. The syntax is as follows: </p>
<pre class="brush:php;toolbar:false"><code class="php">[key1 => value1, key2 => value2, ...]</code>

For example:

<code class="php">$arr = ['name' => 'John', 'age' => 25];</code>

6. String expression

String expression is used to create string. The syntax is as follows:

<code class="php">"string"</code>

or

<code class="php">'string'</code>

For example:

<code class="php">$name = "John Smith";</code>

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